Malicious PDF — malware analysis report

Static analysis result for SHA-256 972b28de0496aa9e…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 17:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ceb3ed99f424942c870a31085c6275df SHA-1: 357fc23635d651010cf2687561049dddc6e661fa SHA-256: 972b28de0496aa9ef38f177737481094e634687d513b00945d0263e0039e892b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous URLs suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3canviq1u1v3ocgeqt0ekpdmro/nugeroxar.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2270f1ab8d448b9e5ce28116c55274bb/rudaxanijoxarixewuve.pdf
    • http://daiichilogistics.com/uploads/news_file/faleda.pdf
    • http://ottotech.center/userfiles/file/gixoril.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa907c95c82---43601896474.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160866d8a1266b---wagakidopijaniril.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/e4nh7uqruk4fbqm97gra8tqr8g/xonojoketepowurigigeg.pdf
    • https://tidaksusah.com/contents//files/povamiwipanij.pdf
    • https://butchercurnow.com/img/shop//contents/28433311834.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f211ea23373d4c445c09c75a8f241eb7/fexixipobuwa.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16097495916620---sisupom.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/373cdacbdf32e44345c065b587d990e2/16331646607.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/7512170371.pdf
    • https://b2cexpressdemo.com/userfiles/file/dipizumelemate.pdf
    • http://garderoba.sk/images/_file/nabugufamotavasomozamo.pdf
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/vataluwopevejoso.pdf
    • http://abpaluso.com/upload/file/lodesapuluxidafapibomen.pdf
    • https://graveyards-fuj.ae/userfiles/files/xukikunumorefagula.pdf
    • http://vintageguitar.ru/ckfinder/userfiles/files/lebatagirusuxemodenutevu.pdf
    • https://ddshower.com/ckfinder/userfiles/files/8420671258.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5d0v589gpsva3cqmbkjsmoq2vv/zijonares.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/zexemamelakibana.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b02372939---14787750753.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94a86a643---22687502572.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f544328d---43877051826.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/qt534aq2ne3167iisb3l4u7db0/99371613640.pdf
    • https://travelstore.tn/userfiles/file/96776435384.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=property+rights+of+cohabiting+couples
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5a.bin
576b62c2fc05fcbd9654e44c8cd3217ce4306c95d011e70b11e2c49d47707396
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 11116 bytes
font_01_sfnt_off00011404.bin
0cf4f76d9a0d4b221c89b5d1ba9cfd81c76db31b7a8a78c3c93980410eb900ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 17044 bytes
font_02_sfnt_off0001403f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1403F 16792 bytes