This is a plugin that has been suggested here in the past. Therefore, some members may have it installed on their sites.
From Wordfence:
If you have a plugin called “Display Widgets” on your WordPress website, remove it immediately. The last three releases of the plugin have contained code that allows the author to publish any content on your site. It is a backdoor.
The authors of this plugin have been using the backdoor to publish spam content to sites running their plugin.