Quick Answer
A WordPress backdoor is hidden persistence that lets an attacker regain access after the visible malware or vulnerable plugin is cleaned. Safe removal starts with containment and backups, then file comparison, database review, credential rotation, clean reinstalls and monitoring. Do not rush into deleting files before ...
If a WordPress site shows malware warnings, strange redirects, spam pages, unknown admin users or corrupted files, do not start by randomly deleting files. A safe cleanup starts with preserving a backup, reducing exposure, finding the entry point and removing the persistence that would let the ...