Unknown domain is connected to my server. Is it Bad purpose? [closed]

I am deploying Web application Using Elastic beanstalk

Currently I've found out that unknown domain is conneted to my server.

Ex) Our service domain is onenonly.io

But test.hellobot.com is connected to my server too.

Maybe I've got to set Allowed Host to secure it. But I want to know How bad people takeover secret infos by doing this.

q1. some weird domain is connected to my server. Is it accident? or bad intention?

q2. If it is bad purpose, then how they takeover secret infos by just pointing their domain to my server ip?

  • I am using Application Loadbalancer with assigned Elastic IP.
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