Malicious PDF — malware analysis report

Heuristics 6

• PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
  PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
• PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
  PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
• Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
  Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
• External URI info PDF_URI
  PDF contains an external URL action
• Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
  The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
• 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://study4student.com/cache/fck_files/file/66549749204.pdf In PDF document text

  • http://standartbio.com/fckfiles/file/30718596077.pdfIn PDF document text
  • http://nhadep30giay.com/uploads/image/files/59136714648.pdfIn PDF document text
  • http://staceyasp.com/UserFiles/file/27998582055.pdfIn PDF document text
  • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/58733988e46ecf569dafa5d55093705d/55313195042.pdfIn PDF document text
  • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/80618822013.pdfIn PDF document text
  • http://ambulatorioveterinariosantanna.eu/userfiles/files/36146011549.pdfIn PDF document text
  • http://kirsanov-maslo.ru/uploads/vebedovurejewoneviwinesid.pdfIn PDF document text
  • https://alshamiltrading.com/alshamilfiles/file/natasutafijizubu.pdfIn PDF document text
  • http://odessawa.com/userfiles/file/31546972901.pdfIn PDF document text
  • https://dbmotorbrokers.com/userfiles/file/13548148356.pdfIn PDF document text
  • http://sskj.pl/userfiles/file/jujawijubosufukabu.pdfIn PDF document text
  • https://electroagro.es/pub/files/28690718413.pdfIn PDF document text
  • http://velapower.com/glwh/UploadFile/file/2021091401153873499.pdfIn PDF document text
  • http://hondaototanan.com/upload/files/mikovekurazevutajeju.pdfIn PDF document text
  • http://geologicatoscana.eu/userfiles/files/kojexezezuvadinibedunolu.pdfIn PDF document text
  • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144993e55dc4---tezikedurepiz.pdfIn PDF document text
  • http://vidol.eu/userfiles/file/bapijarugerosimoto.pdfIn PDF document text
  • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4af2531a---fasigotutelobe.pdfIn PDF document text
  • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ratimalid.pdfIn PDF document text
  • http://business-baltic.com/myfiles/dok/96186330542.pdfIn PDF document text
  • http://d2dgroup.net/upload/files/wukewul.pdfIn PDF document text
  • https://aedwea.com/upload/foto/64946262535.pdfIn PDF document text
  • https://sibiucuratenie.ro/fckeditor/userfiles/file/72857557036.pdfIn PDF document text
  • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=my+android+phone+is+not+ringingPDF link annotation
  • 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/pdf/1.3/In PDF document text
  • http://ns.adobe.com/xap/1.0/In PDF document text
  • http://ns.adobe.com/xap/1.0/mm/In PDF document text
  • http://ns.adobe.com/xap/1.0/rights/In PDF document text
  • http://dejavu.sourceforge.netIn PDF document text
  • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

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