weird japanese store inside my wordpress website

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Hi, by using google and searching for “円 site:mysite.com” I notice that there is an entire “japanese shop” within my website.

There’s a lot of entries like:

mysite.com/hsadoih.html

mysite.com/wdvwa/g3344526.html

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How can I get rid of it? I don’t know the extend of it as it appear to be thousands of url’s like those in google results.

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Edit: seems to be this [https://web.dev/fixing-the-japanese-keyword-hack/]) but I don’t really know If I can follow all the steps.

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