Library Plugin – Ghost Files?

Hi! I have this file blocking my https to work. I need to delete it, but when I search it in the library, nothing appears. I already tried searching by date, name and everything I could. But it just seems that this file doesn’t exist! How can I make to find it and delete it?? Is there any plugin? I would post it in some “Media Library” topic but I couldn’t find it. So feel free to move if needed. But please, someone help me, I’m already losing my mind…

The file is linked at: http://laurak.com.br/wp-content/uploads/2017/07/cabecalho2-1.jpg