Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1fb6559c526254a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 00:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 47b978159e9304e6245f5239efe85b37 SHA-1: 726390d95902f14ee40f1cda5d8b2ef03dd32277 SHA-256: e1fb6559c526254a8204c1c94b249dfe8f3ec3c8afd5ffd2d47d0aacde8d978b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lesfeesdelhetre.fr/upload/files/dasubomejoxugitufepopew.pdf In PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/jijafagotazerib.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db158cc5fc---4841315849.pdfIn PDF document text
    • https://nevisnews.com/userfiles/2995723655.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974d9f31be6---84948054330.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/17087180990.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/31758961400.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/sewezanikegixekebolenubo.pdfIn PDF document text
    • https://premium-house.uz/images/file/10287055118.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/90910276726.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cdf695a9c86c38531c8644e1ce3fcce3/mosofosoxudafujubifetef.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/nolezatana.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/kusowuvefanuzipipi.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/favonugalizasitaza.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/caa27pnn76pute35omjeg26jce/23868545080.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/pitog.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/sigabemedumekido.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/gipevadene.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/37524629887.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/nakisowelozikelomisab.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/18435797008.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a30f095520499dd9a207cf739fc8fb2d/83734367786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=electro+hydraulic+thruster+brake+pdfPDF 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 11044 bytes
SHA-256: fb80c71f34dcfb4183743c7c65c5253ef8d15ef517d5dd27fc1c39744490a494
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 16368 bytes
SHA-256: f4520a64db41a7993feeb63080e24fb1c7c66061a35e6ab41f2dbc0de6ca8683