Spam links of my WordPress

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Hello, guys

Can someone help me out please?

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I use Semrush to check my WordPress backlinks and see a lot of weird links. Thousands of the active links are something like a .pdf attachment with URL of “[mydomain.com/wp-content/uploads/2022/06/XXXXXXXX.pdf]”

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Can someone tell me how these links come out? If this is a bug or glitch of my site, how to fix the bugs and stop the links to be generated in the future?

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Thanks in advance for any insights!

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