First of all you need to find the timestamp on that phpforum files to see when they were uploaded. Then you can check the ftp logs (/home/user/access_logs/ftp.domainxxx ) and access logs (/home/user/access_logs/domainxxx) to see what all happened during that time. If you have any auto script install tools like softaculous / fantastico in cpanel, worth checking the cpanel logs as well (which may need root ). Any way, change the cpanel password for the account as soon as possible.