Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9824251fb363c1e…

MALICIOUS

PDF

87.9 KB Created: 2021-08-05 18:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 45613f7c0165fc0f2829c6fe9c818a4c SHA-1: d46c11b8119ad03a7f371bf9ed804b7adfe6e4e1 SHA-256: b9824251fb363c1e582f2bebcbc758d3aaf950ff6153c326a69b8c44d91457cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that redirects to multiple external URLs, many hosted on compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2d1fa8f610cf8ffce1179bc859fd2177/budoxazo.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bad9804522c---deroner.pdfIn PDF document text
    • http://merwepizza.com/upload/file/64576181544.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160722d1a3903a---sabaxesoneposarefidonuz.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/770365a6225914e03ce9a498fcafb976/27434882079.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/92749743486.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9835f950---tiwotofufupomimifeji.pdfIn PDF document text
    • http://beateromer.com/bilder/file/kerixasi.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/noxiwikow.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c57be72a6---mixujonerudovazof.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/c5db251c6f151d457f8713a955c1a4e7/xatarunu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/39415284984ef6f210e5034b3fa86981/57937788302.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbfda87c4d---pitiforenizujefila.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lisemijobojude.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/lusonarod.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/40008395660.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///23905893920.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3f159dc3e0529c6a52c48bb176a37fbf/bolow.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/zadubavefemebejodoze.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210703_A3E1AFA6329D1B32.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160818a337fcf6---nejosulefa.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/40147106983.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/furebiwusotaxetixebuto.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/lavijizapufevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+metal+are+alex+and+ani+bracelets+made+ofPDF 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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 10976 bytes
SHA-256: 1fc1df54cde6a8b46b5f93c37c7620a3312c7f8e7f26c216558dadcc3e31085a
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 17280 bytes
SHA-256: 56667b74a8f4267ff6363c9bcee31f84d8b36ca232190789d2135b54a3429702
font_02_sfnt_off00013841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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