Malicious PDF — malware analysis report

Static analysis result for SHA-256 466ab585c8f963b9…

MALICIOUS

PDF

90.9 KB Created: 2021-09-04 23:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 688004253531b651a6a5d6d7504b9c0b SHA-1: f076a650cf4d1b157af60b79136538aa82b5f337 SHA-256: 466ab585c8f963b9551f5573bef6a52d54312f6faa3c0041a03c8a6b1777f2e7
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 are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users. Heuristics indicate this is a link farm on disposable hosting, and ML classification strongly flags it as malicious. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=world+history+timeline+poster+pdf PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e43f5cdabf---79904186271.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/fidosipugewaf.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0ea488162ef8e70164e53c8db5ffb530/84637395607.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deda7bf33b3---mojopunugidenorezu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/777455179.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/temolibotirasewe.pdfIn PDF document text
    • http://simonide.org/userfiles/file/67362087713.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/60155594334.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/zemef.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/25775219282.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/56251828618.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9911a4850---wusun.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7ae6a9f37a2a7bf06688c21769f6002d/49061148580.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/81248819135.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491c52577f---dijewub.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/vodejatakebi.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/jutunufidiwovemumabi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/81679965204.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/xadaxor.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160754d3c5ee51---zigejawesukujefagavu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607533a3be56c---fulavavigutiraxaruk.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/65339502482.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_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 17604 bytes
SHA-256: 95a9f29e8c4dbb8a8d1295048e8fc8a23f4ccb69cc20308a89633fca1df7ceb7
font_01_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 10708 bytes
SHA-256: 0bbba3798dd7dcf76a03c46c9bbfdb820e4d38e755a4ee6b86af5317eda38713
font_02_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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