From Bleeping Computer at New Linux malware uses 30 plugin exploits to backdoor WordPress sites (https://www.bleepingcomputer.com/news/security/new-linux-malware-uses-30-plugin-exploits-to-backdoor-wordpress-sites/):
QuoteA previously unknown Linux malware has been exploiting 30 vulnerabilities in multiple outdated WordPress plugins and themes to inject malicious JavaScript.
According to a report by antivirus vendor Dr. Web, the malware targets both 32-bit and 64-bit Linux systems, giving its operator remote command capabilities.
The main functionality of the trojan is to hack WordPress sites using a set of hardcoded exploits that are run successively, until one of them works.
The targeted plugins and themes are the following:
WP Live Chat Support Plugin
WordPress – Yuzo Related Posts
Yellow Pencil Visual Theme Customizer Plugin
Easysmtp
WP GDPR Compliance Plugin
Newspaper Theme on WordPress Access Control (CVE-2016-10972)
Thim Core
Google Code Inserter
Total Donations Plugin
Post Custom Templates Lite
WP Quick Booking Manager
Faceboor Live Chat by Zotabox
Blog Designer WordPress Plugin
WordPress Ultimate FAQ (CVE-2019-17232 and CVE-2019-17233)
WP-Matomo Integration (WP-Piwik)
WordPress ND Shortcodes For Visual Composer
WP Live Chat
Coming Soon Page and Maintenance Mode
Hybrid
Additional information including more add-ons discovered by Dr. Web after further updates is in the referenced article.