Malicious PDF — malware analysis report

Static analysis result for SHA-256 b501ac9331043bbf…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 06:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 357b7b9ed66ab61feef47d7bc279a1fe SHA-1: cd281c227ed32d57c0e22d49cbd8cb14236d8fd1 SHA-256: b501ac9331043bbf1288233565a4b3810cb8851934dd983879170fefa550b286
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aspirans.com/files/file/6106958597.pdf In PDF document text
    • http://ttlh.vn/storage/ckfinder/files/72171770367.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/76714846925.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/rododuruli.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/279946963967f7b06e3d6279fcf7f4ff/58742460195.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/33055419352.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/karibagexoviritanisineze.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805943b6387---sukapitasozisejefi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ae0435edd3208b3ab2256369b21db4fe/17655516159.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9c88e189b163e18bdf064f853535bf73/11900882814.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/benikozomujezepudawa.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nodozu.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/6198019138.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/lafezilur.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/44164628465.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/jovuf.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fb1ed2040---fevonapodus.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075556126cf3---24626214496.pdfIn PDF document text
    • http://salespate.com/userfiles/file/25968604491.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/18932030b050690fafd88f00e707c544/baxonopedaredojuvimudovi.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/bikuzu.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/95477811493.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/72237923336.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b8171e2aa2b81bff9906931d81e88263/97902065225.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zinapi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/861a1c284f3c25e8cb3211cfdeba2d70/texijuxevonuxugowuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=single+moveable+pulleyPDF 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_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 18608 bytes
SHA-256: 60a829b4ca2c1e86cb57dfdc1a565c16eaa81fe831cc601eda12cb0a62ecc67d
font_01_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 10724 bytes
SHA-256: 2540ae7f6830afd6e237ff373efbd8c8c4d7dca2fd8ca771092d3b88e9bb9008
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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