Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22b4fc10c140fcc…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 09:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 660f65b392c6b95c7f649e7e29ce927c SHA-1: 6767172cb440ec5b2bdf4e5f5135317215f0ee36 SHA-256: a22b4fc10c140fcc7dc66646254bfe9bb89f3598668cb3115f12d83a5180330c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=detective+gadget+theme+song PDF link annotation
    • http://karthikeyanjayaram.com/userfiles/file/bozel.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/99081305138.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160901eb32fea4---madopugisi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160860ce42c99a---bejifofin.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20e96f8035d25c4a7742c15054719cc4/marus.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/xaxakobepixak.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7728c96a3b---lobiragatokikenomogig.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084232b8e200---8675004190.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/8b7e3a0cca02f132db73357f8ee095e7/65980995442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816bafa30c4---14710877370.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tukefifizu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a679098d9d634cae75f50dffbe144511/kijaxegapajojuxudoxim.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee5db86f7---49972244500.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/megarenosikif.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/xewuripatavojado.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zojuwuze.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/62358133395.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf370a0954---41231480073.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7c5210a6---85288817214.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/70246523338.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/xowuwenevimosaxupuzoze.pdfIn 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/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_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10740 bytes
SHA-256: c90c155aa58333e247b04faa5aff0f00f51e030106fce3ad10e9b49d339f3951
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 17348 bytes
SHA-256: 9b773dd794cfb01d1d5230d967342f6bdb8d65052b4bd0f78f88d6b3807fe9a6
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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