I'm getting a phishing attack alert when I visit my site. The alert reads:

"Phishing attack ahead

Attackers on example.com might try to trick you to steal your information (for example, passwords, messages, or credit cards)."

I contacted my host and the their scan report said there was suspicious/malicious code in /classes/mail/class.smtp.php

I downloaded a fresh file from the site and replaced the old one but I am still having the issue.

I've run all the files and my computer through avast and malwarebytes and they aren't finding anything.

To make matters worse, the security error isn't coming up in Google's Search Console so I can't get them to review it.

Any help would be appreciated.