What is the file wander.php

When I check my webserver logs for a website that has WordPress installed for the site, I see a bunch of references to GET /Wander.php, yet I see no file called wander.php.

What is this? How is this possible? Here is an example of one of the IIS web log entries.

2022-06-09 13:03:56 170.14.55.33 GET /wander.php 13935jfmr1e41b5.htm 443 – 66.249.74.31 Mozilla/5.0+(Linux;+Android+6.0.1;+Nexus+5X+Build/MMB29P)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/102.0.5005.61+Mobile+Safari/537.36+(compatible;+Googlebot/2.1;++https://www.google.com/bot.html) – 200 0 0 62