None of our clients use the plugin or themes mentioned here as far as I can see. (Ultimate Member plugin and TagDiv Themes)
This August, we’ve seen a new massive wave of WordPress infections that redirect visitors to unwanted sites.
When redirected, users see annoying pages with random utroro[.]com addresses and fake reCAPTCHA images. The messages and content try to convince visitors to verify and subscribe to browser notifications without disclosing the purpose of this behavior.
Full Article: https://blog.sucuri.net/2018/08/massive-wordpress-redirect-campaign-targets-vulnerable-tagdiv-themes-and-ultimate-member-plugins.html