@ultimatemembersupport its the same issue as mentioned in this stackoverflow thread shared by @batfan. All the sites hosted in that server got infected and was getting redirected. header.php of all the themes had a malicious script that was adding redirect. Removing those lines and updating Ultimate Member plugin to v2.0.23 resolved the issue.
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This reply was modified 6 years, 7 months ago by Vishwas.