Recently, internet fraud aimed at users of e-commerce platforms have intensified. It is a fraud that is aimed at people who want to sell some of their products online. Communication usually takes place via messages via mobile phones. The phone numbers used are mostly from abroad. The alleged buyer begins the communication by asking whether the product is still available and whether they can make the purchase electronically. The buyer usually immediately accepts the agreed price and asks the seller to click on the link, which leads to the page where he is required to enter in certain fields the data from the bank card, in order to allegedly make a payment. The look of the message seems credible and reliable to most people. The victim fills out a form and thus forwards his data to the attacker, who uses this data to steal money from the victim's account. In this paper, we have described a practical example in which we presented one such attack on an online advertising site in Bosnia and Herzegovina. The aim of this paper is to acquaint people who sell products online with great danger, which they can be exposed to if they are not careful enough and if they readily accept to give their personal data to unverified persons.

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