Detail: November 2022 client report 5 sites issue malware.
This effect mobile only, when site wordpress at FRONT END click will open other site
Solution: backup files before edit
Setup: 'wordfence plugin'>Scan >list issue
Step by step: as detail report
1. theme /functions.php : require clean code
2. mplugin.php : this is malware -> remove
3. theme/ template-config.php clean code