Malicious PDF — malware analysis report

Static analysis result for SHA-256 721f8a8445f128b6…

MALICIOUS

PDF

88.9 KB Created: 2021-09-18 02:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 04747837ced13a650ac465cce05600cf SHA-1: f62427c5e3170f574e8156d604216a10ac69f460 SHA-256: 721f8a8445f128b6a752151e80200819b2316876405d9ec1ce9c86bc252d7fd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://archism.ru/uplcv?utm_term=download+gta+grand+theft+auto+5+for+android PDF link annotation
    • http://degrossier.nl/uploads/file/78629673888.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154ee6611d---galegux.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/55845188711.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/94491836406.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/nuvalesifokinonefexo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4a9322e1---75569657375.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210914_58F8E50D5A641478.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/bapazutajuxizopezos.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/pitus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/81375306913.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/wuzovovidofibozogeva.pdfIn PDF document text
    • https://dukupahit.com/contents/files/20142770773.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134649cb3a15---97421636060.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143af648b0aa---zibewemifiba.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/zulimumukadurolozop.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/wijil.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/33151921758.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/vuzukujuginulopuli.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/jumixawixubevi.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/11160227811.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/75575890236.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/jovozogomun.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/makosetomam.pdfIn PDF document text
    • http://strahyi.ru/images/file/levopawadi.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/9757489898.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 24052 bytes
SHA-256: 133cab05da1776c27a950946614f4283a77974ebcdd3d698f64e4404fb9d7298
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 16452 bytes
SHA-256: a6d911e56e53a7647488336748e806a4b0b71865659889857a0328a1e0e87a63
font_02_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000123ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD1 10788 bytes
SHA-256: 56e9e4bd5d28295acc34126181759db56d0a97dc1d29c439afaa21adad03cbca

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