Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e67bfc3e2e4fdce…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 05:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd30cd583ef3c51555b0e49bc4828a8e SHA-1: 3cdec4046a3a94933d78081775fcda8fc5b831cf SHA-256: 4e67bfc3e2e4fdce4ba614d127020da40a8cb824bed2a494c7bb579f8d120d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

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 https://queure.ru/uplcv?utm_term=ews+reservation+eligibility+pdf PDF link annotation
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/b3f3eg06uva98q7plev2cjarh9/81758772153.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/wofuw.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0ddf84a04---bogajaf.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210803154606.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07a885915---pugubofipufukibesurew.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/zepimikuwezolozamuzob.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/gptlgul9mc6r2hqaiotfl8mbot/nurizebotefofuvojokunove.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8cbhdl41icj6uh7083h436f81o/genadoxivorosivo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/070004fb25e695097678f76838728a34/39582400335.pdfIn PDF document text
    • https://bold-iot.com/uploads//files/202108092201139141.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nugubogi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-28/20210728092954613742.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/97198084668.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/kugaripifixofugeruwo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a12143f6b---bipiliruwetolojesagosona.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/rerafibajufidimaluzenuveb.pdfIn PDF document text
    • https://altbuket.ru/files/1371826815.pdfIn PDF document text
    • http://93564497.com/userfiles/tonogixitejipupolokizodaw.pdfIn PDF document text
    • https://topupdana.com/contents//files/1988798130.pdfIn PDF document text
    • https://peterdegendt.be/file/64649115890.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799bb005567---91607677675.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba4155f64---lonekoseme.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/dagasinebidimojozirutu.pdfIn PDF document text
    • http://fgosvo.ru/files/files/rebemotuxokeguvezolom.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16080da7d05fc4---43460471602.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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 18844 bytes
SHA-256: d7ab392e53e1197c6b5382ef2f2b834658a618dcf328e3ac59feae36a5b51458
font_01_sfnt_off00011054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 11064 bytes
SHA-256: 25cc637cb49891d85a5cfe4ffe54598ab23979dea35da0ff04a39b874a4ce3d5

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