Phishing attacks usually get framed as something that happens to your inbox. Suspicious emails pretending to be from banks or shipping companies trying to steal your credentials. The reality is that phishing also happens on websites, often using compromised sites as platforms for the attacks.
If your site gets used for phishing, your visitors get harmed, your brand gets damaged, and your hosting account may get suspended. The attackers benefit. You pay the price.
This piece covers what phishing on websites looks like, how sites get used for phishing, and how to prevent and detect it.
What Website Phishing Looks Like
Phishing on websites takes several forms.
Fake Login Pages
The most common form. The attacker creates pages on your site that look like login pages for popular services. Bank logins, PayPal logins, email service logins.
Victims who land on the page (often through phishing emails) think they are on the legitimate service. They enter their credentials. The credentials get sent to the attacker.
The pages often live in obscure directories on the compromised site (like /uploads/temp/login/). Site visitors who arrive normally never see them.
Fake Account Verification Pages
Similar to fake login pages but framed as “account verification” or “security check” pages. The attacker claims the user needs to verify information or confirm their account.
The information requested is typically credentials, security questions, or personal information that can be used for identity theft.
Fake Payment Pages
Pages that look like checkout or payment processing for legitimate services. Visitors enter credit card information that goes to the attacker.
Fake Survey or Prize Pages
Pages claiming the visitor has won something or asking them to take a survey for a reward. The “claim” or “reward” process requires personal information.
Brand Impersonation
The attacker uses your site to impersonate another brand entirely. Visitors think they are on your site (it is your domain after all) but the content impersonates someone else.
This combines brand abuse of two brands at once.
How Sites Get Used for Phishing
The attackers do not need administrative access in all cases. Several patterns enable phishing.
Compromised Sites
The most common pattern. The attacker breaks into your site (through any of the methods covered in previous pieces in this series) and uploads phishing pages.
Once installed, the pages stay until removed. The attacker may use the same compromised site for weeks or months before moving on.
Open Upload Forms
Sites with file upload functionality that does not restrict file types properly let attackers upload PHP files (which can host phishing pages) or HTML files (which can be the phishing pages themselves).
Even well-intentioned upload features (forum attachments, profile pictures, document submissions) can be vectors if not configured carefully.
Vulnerable Comment Systems
Some comment systems allow HTML content. Attackers can post comments containing phishing payloads. If the site does not properly restrict comment content, the phishing payload becomes part of the page.
Subdomain Takeover
If your site has subdomains that point to services you no longer use, attackers can sometimes claim those subdomains. They host phishing content there. The content appears to come from your domain.
Compromised Plugins or Themes
If a plugin or theme contains malicious code (either from the start or after a developer is compromised), it can include phishing functionality.
Why Phishing on Your Site Hurts You
The damage extends beyond the phishing victims.
Brand Damage
Your domain gets associated with the phishing. Users who lose money or credentials remember your domain as the site that hurt them.
Even after cleanup, the association lingers. Your brand looks complicit even when you were just a victim.
Blacklist Listings
When phishing is detected on your site, blacklists get updated. Google Safe Browsing, Microsoft SmartScreen, browser warning systems. Your site gets flagged.
Visitors using these protected browsers see warning screens before reaching your site. Even legitimate visitors get scared away.
SEO Penalties
Search engines may penalize your site for hosting phishing content. Rankings drop. Traffic decreases.
Recovery from search engine penalties takes weeks to months.
Hosting Account Suspension
Most hosting providers suspend sites that host phishing content. Your entire site goes offline until you clean it up and demonstrate it will not happen again.
Legal Exposure
In some jurisdictions, your role as host of phishing content might create legal exposure. The legal risk depends on your jurisdiction and whether you can demonstrate you were not negligent.
Customer Trust Damage
If your customers find out your site was used for phishing, even if they were not directly affected, their trust in your business decreases.
How to Detect Phishing on Your Site
Several methods help identify phishing content.
Active Malware Scanning
Tools like Sucuri, Wordfence, and MalCare detect phishing content as part of their broader malware scanning. The scanners recognize known phishing patterns.
Run regular scans. Daily for active sites.
File System Monitoring
Tools that watch for new or modified files alert you to unauthorized additions. New files in unusual locations are suspicious.
For phishing specifically, look for files in image directories that are not actually images. PHP files where they should not be.
Web Server Log Review
Phishing pages often get accessed from specific email campaigns or attacker sources. Unusual traffic patterns can reveal phishing pages.
Logs showing significant traffic to URLs you do not recognize warrant investigation.
Google Search Console
Google may notify you through Search Console if they detect phishing on your site. Check Search Console regularly.
The notifications often reveal phishing you did not know about.
Browsing Your Own Site
Sometimes you find phishing by accident. Searching for site:yourdomain.com on Google can reveal indexed pages you do not recognize.
Looking at the sitemap if you have one shows what pages exist. Pages that should not exist are red flags.
User Reports
Sometimes customers report receiving phishing emails that link to your site. Take these reports seriously. Investigate immediately.
How to Remove Phishing Content
When phishing is found, removal is the priority.
Take the Site Offline If Necessary
For severe cases (multiple phishing campaigns, heavy traffic to phishing pages), taking the site offline temporarily stops the immediate harm.
Identify Affected Files
Find all phishing-related files. Pages, images used in the phishing, scripts that process submitted data, files that store stolen credentials.
Scanners help identify these. Manual review may find more.
Remove the Files
Delete the phishing files. Be thorough. Files in subdirectories, files with disguised names, files in unexpected locations.
Check for Backdoors
The attackers installed the phishing content. They likely also installed backdoors to maintain access. Find and remove them.
Without removing backdoors, the phishing comes back.
Update All Credentials
Assume credentials are compromised. Change everything.
Check Database
Some phishing functionality lives in the database. Stored data, user accounts, configuration entries. Audit the database for unusual entries.
Verify Complete Removal
After cleanup, run scanners again. Check the site manually. Make sure nothing remains.
Recovery After Phishing
Beyond the technical cleanup, several steps help recovery.
Submit Blacklist Removal Requests
If your site got blacklisted, request removal from each blacklist:
Google Safe Browsing (through Search Console).
Microsoft SmartScreen.
Norton Safe Web.
McAfee SiteAdvisor.
PhishTank.
OpenPhish.
Submission processes vary. Most require demonstrating that the phishing has been removed.
Notify Your Host
Your hosting provider may have suspended the site or be considering it. Communicate proactively about the cleanup and prevention measures.
Submit Reconsideration to Search Engines
Google Search Console has a process for requesting reconsideration after security issues are fixed. Use it.
Communicate With Customers
If customers may have been affected (their data exposed, phishing emails sent in your name), notify them. Honest communication builds more trust than silence.
Document Lessons Learned
What allowed the phishing? What detection failed? What response could have been faster? The documentation informs better practices going forward.
Preventing Future Phishing
The defenses are mostly the same as defenses against other compromises.
Strong Authentication
Strong passwords. Two-factor authentication for admin accounts. The defenses against compromise generally are the defenses against being used for phishing.
Software Updates
Keep all software current. Most phishing campaigns enter through vulnerabilities in outdated plugins or themes.
Restrict File Uploads
If your site has upload functionality, restrict it carefully. Allow only specific file types. Validate file contents, not just extensions. Store uploads in non-executable directories.
Web Application Firewall
A WAF blocks many attempts to install phishing content. Cloudflare or similar services provide protection.
Active Monitoring
Real-time monitoring catches phishing content fast. The faster the detection, the less damage and the easier the cleanup.
Subdomain Management
For sites with subdomains, audit them periodically. Remove subdomains pointing to services you no longer use. Prevent subdomain takeover attacks.
Limit Admin Access
Fewer admins means fewer credentials that can be compromised. Lower-permission accounts for content editors and other non-admin roles.
Bringing the Anti-Phishing Picture Together
Phishing on your site is one of those problems that hurts both your visitors and your business. The attackers benefit. Everyone else loses.
The defenses are the same general security measures that prevent other compromises. Strong authentication, current software, WAF, monitoring. Sites that have these in place rarely get used for phishing because the entry points are closed.
For sites that have been used for phishing, the recovery is methodical. Clean the content. Remove backdoors. Update credentials. Request blacklist removal. Communicate with affected parties. Implement better defenses.
The cost of being used for phishing extends beyond the immediate cleanup. Brand damage, blacklist consequences, search engine penalties, customer trust erosion. The math favors prevention overwhelmingly.
For most sites, the path forward is making sure the basic security measures are in place and verified. If your site uses upload features, audit how they handle user-submitted content. If your site has subdomains, audit them for stale entries. If your site has weak credentials, fix them.
Sites that take phishing prevention seriously rarely have these incidents. Sites that ignore it eventually get used for phishing because automated tools constantly probe for opportunities. The investment in defense is modest. The protection against being used as a phishing platform is real. The decision to invest in prevention is the most important decision. The technical work follows from that decision.
