Why does an ad page open when I browse my websites’s wp-admin page?

In fact, there are an infinite number of possibilities that could cause this.
First you have to change the name of the activated theme and plugins from the file manager.
Then log in, in case this redirect did not occur
You can start activating plugins and theme one by one until you find out what caused this

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)