Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd5fa532dc8a21bd…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 16:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97b8255a89fc554dc23473b04a01b67a SHA-1: 4d31580ac16df3de55ee7ad99fd6c477ec4e60c2 SHA-256: dd5fa532dc8a21bdf03f519ce319619cf50f2150aaed8b3b90d9f5efa46cf3fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613debefe4ca2---34784092292.pdf In PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/55934574255.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l2phc2gtdcf9debe63del6jcs1/56064519143.pdfIn PDF document text
    • https://comfort8889.com/upload/files/kobujuzelekevadanonu.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/10133414425.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/batagavofav.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/7389964096.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/505e941b6f57e14db93c7fda7e0e1019/7274726531.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/megovate.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/lobalaweporojubowubobikex.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe14f41a17---razomo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/658bd19b4ff130db425c21a0f6b5e5dd/713246500.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/muwunim.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/87839348873.pdfIn PDF document text
    • http://kelvista.lt/images/files/bubutemudukusefivif.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/42744988015.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/gudukubosejipiragenasuv.pdfIn PDF document text
    • http://elpijisystem.com/file/78288245366.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/vutefomadabetasawo.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/balurigegizawebapu.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/velaz.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/burugigefugepezeparavudi.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/pazapaxexofadad.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamixirowekafiti.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/debimavato.pdfIn PDF document text
    • http://unsersohn.ch/images/file/ruluzigosapuwoguwimiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+phone+on+macPDF 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_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 10448 bytes
SHA-256: 85113ec4bc06ffaab24831102a98d1df4ddb4252d601a5b3080b6fa2cba9ed14
font_02_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 17764 bytes
SHA-256: b1bff3a9b013160de1c2ef2ecc7d6987e919d32c6234aa4b726e760d323c7556