Malicious PDF / .VIR — malware analysis report

Heuristics 6

• Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
  Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
• Cracked-software lure uses shortlink/download gateway critical PDF_CRACKED_SOFTWARE_SHORTLINK_LURE
  PDF visible text advertises a crack, serial number, archive, or pirated-software download and pairs it with a shortlink or encoded download gateway. This is a high-confidence social-engineering carrier for unwanted software or droppers; the PDF itself is not a parser exploit.
• PDF links to a cracked-software download doorway (base64-obfuscated) high PDF_CRACKED_SOFTWARE_DOWNLOAD_DOORWAY
  PDF's embedded link hides a pirated-software title as a base64 blob inside the URL path/query (and/or carries the ``download|`` doorway-template marker), rather than in visible text. This is a TCPDF-generated SEO doorway that ranks for software-piracy searches and funnels users to fake 'crack/keygen' download pages distributing adware, potentially-unwanted programs, or droppers. The base64 encoding is deliberate obfuscation to evade plaintext lure rules; the PDF itself carries no parser exploit — the risk is the linked crack-download destination.
• Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
  Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
• External URI info PDF_URI
  PDF contains an external URL action
• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL http://evacdir.com/converters/eicosapentaenoic.U3RlYWx0aHkgZm9yIE9wZXJhU3R?phytochemical=reserved/ZG93bmxvYWR8NHV0TWpsMGFYeDhNVFkxTkRRek5qWTFPSHg4TWpVNU1IeDhLRTBwSUZkdmNtUndjbVZ6Y3lCYldFMU1VbEJESUZZeUlGQkVSbDA/satchel/ PDF link annotation

  • https://studiblog.net/wp-content/uploads/2022/06/fonthals.pdfIn PDF document text
  • https://frostinealps.com/wp-content/uploads/2022/06/barrgarr.pdfIn PDF document text
  • https://mdfplus.ru/wp-content/uploads/2022/06/MagPlot.pdfIn PDF document text
  • http://r-posts.com/wp-content/uploads/2022/06/manapil.pdfIn PDF document text
  • https://sportsworldtulsa.com/wp-content/uploads/Crayford_Manor_House_File_Lister.pdfIn PDF document text
  • http://campustoast.com/wp-content/uploads/2022/06/delfimo.pdfIn PDF document text
  • https://www.giggleserp.com/wp-content/uploads/2022/06/Website_Layout_Maker.pdfIn PDF document text
  • https://puntorojoec.com/wp-content/uploads/2022/06/daecass.pdfIn PDF document text
  • https://bhogya.online/wp-content/uploads/2022/06/LanHunt.pdfIn PDF document text
  • https://jovenesvip.com/wp-content/uploads/2022/06/Office_Backup.pdfIn PDF document text
  • http://evacdir.com/converters/eicosapentaenoic.u3rlywx0ahkgzm9yie9wzxjhu3r?phytochemical=reserved/zg93bmxvywr8nhv0twpsmgfyedhnvfkxtkrrek5qwtfpshg4twpvnu1iedhlrtbwsuzkdmntundjbvz6y3lcyldfmu1vbejesuzzeulgqkvsbda/satchel/In PDF document text
  • http://www.tcpdf.orgIn PDF document text
  • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
  • http://purl.org/dc/elements/1.1/In PDF document text
  • http://ns.adobe.com/xap/1.0/In PDF document text
  • http://ns.adobe.com/pdf/1.3/In PDF document text
  • http://ns.adobe.com/xap/1.0/mm/In PDF document text
  • http://www.aiim.org/pdfa/ns/extension/In PDF document text
  • http://www.aiim.org/pdfa/ns/schema#In PDF document text
  • http://www.aiim.org/pdfa/ns/property#In PDF document text
  • http://www.aiim.org/pdfa/ns/id/In PDF document text

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