Older Content Disapearing

Hello,

I have had my site for almost a year now, some of my older posts are becoming corrupt/content disappearing. When I click on the content this url comes up:

https://guidesecuresoft.ru/magestic/index.php

My web site is andypeninger.com
If you need to see the example, just search ‘textures’ click on the top one. On that post, you can see that all of the images are gone and when you click download now, the above link comes up rather than downloading.

When I go to my Media, all of the content that is supposed to be displayed on this page is still in tact. You can also see examples if you go to my Blog page, then go to about the 5th page and you can see all of the preview images have disappeared.

Any help is appreciated, thanks.