During a recent investigation we found the plugin Super Amazon Banners to be serving malware/spam via the domain seoranker[.]info. We suspect that the domain expired and was registered by somebody else who is using it to serve the malware now.
The plugin causes this javascript to try and load a popup (popupHtml) with many spam links to external sites. Also appears to be causing loading issues and some pages refuse to load at all:
(function() {'use strict'; if (window['shbNetLoaded']) return;window['shbNetLoaded'] = true;var popupHtml =
The issue was reported to WordPress and the plugin can no longer be downloaded, it was closed. We recommend removing the plugin from your WordPress site if you are using it.