Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65f37f29b438e66…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 17:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a86c08060897a2e9ce13f2f92f060c67 SHA-1: c9499a1a1fa4b57d8fd361c8a047292288afd233 SHA-256: a65f37f29b438e6630b69808f682d611c490d3d3c62accc06e1bce7ed07b7b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, despite the lack of executable scripts. The file's purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/jobivejanawupimesebum.pdf In PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/bejede.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/xerefup.pdfIn PDF document text
    • http://email-database.info/userfiles/file/7911184217.pdfIn PDF document text
    • https://majubesar.com/contents//files/71846697458.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/momepupodaremazudedut.pdfIn PDF document text
    • https://magatek.com/documents/file/gidenutibemote.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ff6b91ec---bofeg.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/77434207589.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/gos87upnitr2og5pgg8tj1fnvf/5466270654.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4b204130cea2fb4e37eb3836b8cd428c/pamoboritejef.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/werorotuvapekik.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/247f551c3fc05840cf26d11a8a763821/75273122635.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9a2d4d00bf168d05124a7736aabdd2aa/lutasifutabemogavula.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/18661198192.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/43755565802.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea874a2f52604b5f91e4be4d42450ef8/momasajexabatit.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/jaletap.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/b2b9b9td2djlasbupeoqnpekq0/xevozudagipojebugil.pdfIn PDF document text
    • http://chinalabware.es/d/files/16617825905.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/rolugedofalijun.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/zejalivigevirosudubod.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/gutogumowuwegonadaviki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+crater+in+englishPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 16364 bytes
SHA-256: ad42223a3f802c504f90c285b2138b9d082fac451209d2abd66def8f3728ebe0
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10608 bytes
SHA-256: 6b21e67eb1833b0981b5d937278d6e80149da10e25c3b52ae58c6fa04230d833
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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