Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6af198fe6d92605…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 01:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c60e9a2d6fdbd655505e95d7c65bb97 SHA-1: f7e682c49393755fa96a93f98312c8e2ec6e1207 SHA-256: d6af198fe6d92605568657aa0c495f06ea53d8df7a5be45e1a3a0c78ca6b7288
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://96stone.ru/userfiles/file/23397820736.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caaabbac95---bipovigofokuzixogigokupo.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/jazemefoke.pdfIn PDF document text
    • http://ustunongel.com/image/files/66650519734.pdfIn PDF document text
    • https://kenadong.com/contents/files/68685501791.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/43251801927.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zatokagalu.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/33775103455.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/97035094803.pdfIn PDF document text
    • https://spyboarcams.com/files/14597797178.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27c0339c5---zubezinavuxopo.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/5909099546.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/14849101557.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913061240.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/lebebilokufiwa.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210910025454.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/biguxakowogadeva.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/keguv.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/87321839937.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/79511831468.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/omhctab7kt7a94vf2dnkc2ik05/78714745561.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/94571483077.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/vulugabomubipirukajek.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161333b8eb5e82---91508177902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+games+for+android+onlinePDF 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 10692 bytes
SHA-256: a29d9e17bbe493672da6c4e22319bb9afc35375e7ec3ec5b90f910e458738319
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 17296 bytes
SHA-256: 5adeb002029e230cab4ee10dbdf2e07ed493822dd8af915d1cf3e3d24ac7f984
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1