Bulk unknown data inserted today, urgently!

More than 2,000 visited data are inserted in Piwik’s database in 5 minutes. That’s unusual. And the data has recorded from 28, Sep to 30, Sep, but you know it’s 28, Sep now.
Many unknown data are visited from www.phpmyvisites.net, which is displayed in Franch, others are also from some Franch websites like www.phpscripts-fr.net. I am confused why so many visited data are inserted in my Piwik’s database in several minutes from these websites. You know I didn’t find any link to my website.
Is it a Piwik’s bug?

Visit Generator. There’s no confirmation screen, so if you accidentally click on the link while logged in as admin, away it goes… We’ll be changing this.