Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b8148044bd158b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b9c269399b7f0e68d0b376a361300af SHA-1: 28453e3d31ab4ac2030064bd4fa30736e5172231 SHA-256: 93b8148044bd158b27252f96077798d140a901568762355c6f815ba3924085b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=top+10+dragon+ball+z+games+for+android
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149bce6397dd---wimuxiposorebid.pdf
    • https://driftwoodcc.com/userfiles/files/61331447001.pdf
    • https://viceda.com/userfiles/file/64526231438.pdf
    • http://www.rify.us/cms-uploads/files/79056055748.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/72580060567.pdf
    • http://gorisum.net/fckeditor/upload_file/file/muwogijunazugizonesij.pdf
    • https://ltssinternational.com/res/wysiwyg/file/witogadavikobotate.pdf
    • https://oferta.lt/i/File/30074669341.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161354efa5a521---61285149584.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/23802140615.pdf
    • https://lostfoundglobal.com/userfiles/file/jovigetenaruj.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/91a99d81c6ef62ae319a4e9403bfcd66/22562483036.pdf
    • http://ayurveda-shiatsu-nice.com/upload/files/pedewibumerupam.pdf
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/55421138381.pdf
    • https://tttinox.com/upload/userfiles/files/90517980421.pdf
    • http://satyamtracparts.com/userfiles/file/podefuge.pdf
    • http://joyear.com/ckfinder/userfiles/files/34967281120.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/bilaku.pdf
    • https://viettrungson.com/media/Files/9922513079.pdf
    • https://mantyobras.com/userfiles/file/balosukopotinovizomopor.pdf
    • http://nissanotogovap.net/uploads/images/files/57399856154.pdf
    • https://fceresources.com/ckfinder/userfiles/files/wojowat.pdf
    • http://iccjsc.vn/images/uploads/files/jututisipuw.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130689d806f0---12793247492.pdf
    • http://studiopignotti.it/userfiles/files/jobudekiga.pdf
    • 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_off0000de3b.bin
609a77a956d82840b8ee2a638d150015d013e761e6742d9be6a9ebcf1e5b3546
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 11080 bytes
font_01_sfnt_off0000f79a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 16792 bytes
font_02_sfnt_off00010fac.bin
6d293c3d779a845eba4a5cae422515d00b7f79cddf2aa17943e8b1d7c87bcd33
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 17876 bytes