Urgent Malware Fix Required for Education Site

My custom-built education aggregator website has been flagged as level 3 blacklisted by ucerprotect. This is causing issues for users with antivirus software, who are being warned about potential malicious content. I need a seasoned web professional to diagnose and rectify this issue as soon as possible.

Key Requirements:
- Diagnose and fix the issue causing the site to be blacklisted
- Ensure the site is safe and secure for all users
- Experience with e-education platforms is a plus

Background:
- The site has recently undergone modifications, including changing the status of certain video content from mandatory to non-mandatory. Additionally, some new features like reviews and FAQs were added.
- It's possible that these changes may have contributed to the current issues.

Ideal Skills:
- Web security expertise
- Experience with education aggregator platforms
- Ability to diagnose and fix complex web issues

Actions Taken:
- A malware scan has been conducted.

Please note, I'm unsure about any recent third-party integrations as I don't have direct access to that information. Prompt action is crucial to restore normal service for my users.