Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d552fe9a22c001…

MALICIOUS

PDF

78.3 KB Created: 2021-08-07 01:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66a9f88cccfbeb5ab5b3a71998f550fd SHA-1: 431d0b8eb79b156200223c7c968cd798f89cc11b SHA-256: 35d552fe9a22c00165a5acc7f4eae836cd4e01819c9cb75ac2edbc040d670637
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jukssmgm2775qdurdcco7ruub4/vilapujit.pdf In PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/4025657266.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e070e596329---koravurilosewipew.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/15855954535.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3bc2930f01600c642530bb01ac10f58c/98879739205.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/55472063829.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757dcde8f3e---51875818922.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078a57693aa8---58664640601.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee43b618f59---xutumupepolonobefokep.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/folujutugurasajujominuz.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/popegikeritavotevorijase.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/40193140032.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/senabilagenex.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a6d912cb75f9f54fe4228229f52c2d9/simoxidigipileworojo.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/28320fb2b429471160dcfbd009795d63/pifoxoj.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08214f7c7---62845076702.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/6195091915.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/1016739941.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/95fde550eae65384f3de0a45e3ad46bf/rofejofawoxafulijaliki.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089599d32c24---38860408619.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/t8fkjkrhrpvkp6ni9aul33qc25/94406048965.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e54fb852939f3700d029ca3a930e6b7c/rosazoguvawiriju.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/wulurowiboguvetavuvuno.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/1ailgvb842ta4qpmst753usrft/polisuzowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=inter+caste+marriage+benefits+maharashtra+application+form+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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 11016 bytes
SHA-256: fd40cf07c4d8e08910c9fd92bedd77d9deab75f7842fbee5adcf7fa3f5213921
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 16236 bytes
SHA-256: 7c2801e2426a797475897c11ebb15aee8825eb75694e2fc5e9a41981c77fc5f8

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