Malicious PDF — malware analysis report

Static analysis result for SHA-256 3299d20d506dd040…

MALICIOUS

PDF

79.4 KB Created: 2021-10-13 12:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16e9c992720bd3784c7adb95505e8806 SHA-1: 8093cd631d89f3d0bfbbd91f5c9a6d65b854988d SHA-256: 3299d20d506dd040e3968344109ef87566242aefb8585d772f31feab65e106fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_FAKE_CAPTCHA' indicates the document presents a fake CAPTCHA or human verification prompt to deceive users into executing commands or interacting with the document, likely to download a second-stage payload. The numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggest a link farm designed to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://steelbo.com/uploads/admins/u0/files/20210912195253.pdf In PDF document text
    • https://adesso-moosburg.de/images/file/696107336.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131d717a9bc9---60450239949.pdfIn PDF document text
    • http://a899.net/userfiles/file/lutiderajos.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/86911262361.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/fanukofagijituwixaraxem.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/46098853613.pdfIn PDF document text
    • http://vitrine-prof.com/files/23174583077.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/kulimutusotinafuluxugom.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/12530725421.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/pukasumikiluwulol.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7cea58f95---fokagejinus.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/9922196650.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d4f2f48350c87c637b9e26a43a652641/jabitimodat.pdfIn PDF document text
    • https://pisausakti.com/contents/files/80528198404.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/varujawuxugirowuwiv.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/26861559347.pdfIn PDF document text
    • http://guowangcable.com/d/files/81608270974.pdfIn PDF document text
    • https://fong-cai.com/upload/files/55560865943.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/wakujuzetafuginatowivu.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/7501286938.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec035a3bc1---47939510611.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613204acdcca4---gugegasodepiwuzatokanej.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ea1b45ca49---muwovimabojupetepema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=lateral+definition+mathPDF 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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 18484 bytes
SHA-256: b57f27c9cece38a523016e0264d44ee602189bdc9795f1410c7a103dea7f2afe
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 10408 bytes
SHA-256: e8ee717d6e660e2790f68f0b88a79378c80459865ec613a997331e8c56e9acf7

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