How to determine the reason for the redirect on the site?

Question

Joomla

There is a site on joomla. Sometimes when clicking on menu links, a redirect occurs to this URL

cmsjoom.ru/components/com_weblinks/2/separator.php

Once the link opens correctly, the next time this redirect goes.
Yandex shows that the site is not infected.
I tried to make a sitemap for the site using an on-line service, it shows the same redirect.

Has anyone come across this problem or have an idea for a solution?

Answer 1

This is how I managed to heal.
1) componets/com_weblinks/router.php
Delete the line with preg_replace on top.
2) clear the cache
3) Update to Joomla 2.5.28
Update: I
also found it.
/componets/com_content/articled.php
/componets/com_content/category.php
/includes/inc.class.php
Delete.
/includes/application.php
Remove the include from above
After that, it was no longer possible to catch the redirect. For now, I'll assume I've cleaned everything. I'll find something new, I'll update.