What malware redirect resides here?

[polonus]

See: https://urlscan.io/result/181a727a-6a6a-4047-9e33-f0a3b16f1cfc/
Given and alerted as with malicious activity.
Not detected here: https://sitecheck.sucuri.net/results/https/autoredireclare.blogspot.com
No engine to detect the redirect: https://www.virustotal.com/gui/url/92e1397e440d20993815de3ccab7c10552071b2971b81a743958873bdaf0175c/detection
Redirect via script (window.location) to: -https://tosieklei.pl/vendor/phpunit/phpunit/src/Util/PHP/update/app/

Word Press CMS issues for -https://tosieklei.pl/:

WordPress Plugins
The following plugins were detected by reading the HTML source of the WordPress sites front page.

Plugin   Update Status   About
wordpress-seo 15.2.1   Warning   latest release (15.3)
https://yoa.st/1uj
w3-total-cache 0.15.1   Warning   latest release (0.15.2)
https://www.boldgrid.com/totalcache/

Plugins are a source of many security vulnerabilities within WordPress installations, always keep them updated to the latest version available and check the developers plugin page for information about security related updates and fixes.

There are likely more plugins installed than those listed here as the detection method used here is passive. While these results give an indication of the status of plugin updates, a more comprehensive assessment should be undertaken by brute forcing the plugin paths  using a dedicated tool.

User Enumeration
The first two user ID's were tested to determine if user enumeration is possible.

Username   Name
ID: 1   admin   
ID: 2   mmajorek   

It is recommended to rename the admin user account to reduce the chance of brute force attacks occurring. As this will reduce the chance of automated password attackers gaining access. Take note that if the author archives are enabled it is usually possible to enumerate all users within a WordPress installation.

Retire.js (retirable jQuery library detected) -
jquery   3.4.1.min   Found in -https://tosieklei.pl/wp-content/themes/fixall/js/jquery-3.4.1.min.js<br>Vulnerability info:
Medium   CVE-2020-11022 Regex in its jQuery.htmlPrefilter sometimes may introduce XSS   
Medium   CVE-2020-11023 Regex in its jQuery.htmlPrefilter sometimes may introduce XSS

polonus (volunteer 3rd party cold recon website security analyst and website error-hunter)