Came across this site http://newpdfebooks.net/truths-i-learned-from-sam-by-kristin-butcher/ and since I wrote this book and knew nothing about PDF format, I contacted my publisher. My contact there informed me this is a pirate site and to click on any of the links could lead to a boatload of viruses. They said I could report it to you, so I am.
Most of the support is done by unpaid volunteers – another part of the problem is that the sites you found are not hosted here on WordPress.COM so there is nothing that anyone can do here other than give you some help on the steps that need to be done
As auxclass says, since http://newpdfebooks.net isn’t a WordPress.com site, your publishers will need to pursue other avenues to address any copyright infringement. For your information, the site is being hosted by Inception Hosting Limited – http://inceptionhosting.com/