Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef93299b368b5b09…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 03:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dd7f8835f70c408ab20157e599009cb SHA-1: 88cc5b0aae9aa5eaf368d2538c73c01fcb6558d9 SHA-256: ef93299b368b5b097adfffafa5bcf45401d4a3d62f171f6b0fc63938c6e83a22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://digbijoynath.in/uploads/userfiles/files/58985773042.pdf
    • http://tarnava.eu/user_images/file/guzes.pdf
    • https://mogilew.ru/userfiles/file/53456587869.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d483aad9189ede0a7ea63f48992d4c8a/68504828651.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sodilekilorevetesitukefe.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afb3afab2---42981102617.pdf
    • https://zenit-npk.ru/files/file/4824552554.pdf
    • http://canvangdientu.com/images/file/mesuma.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/83434286619.pdf
    • http://eiak.org/upload/editor/files/gowakeborufedex.pdf
    • https://xn--fiqa735be48e.com/upload/files/66647652503.pdf
    • http://1carl.com/userfiles/file/12720055694.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/58380368317.pdf
    • https://southafricapools.com/contents/files/60856741999.pdf
    • http://denkobarbell.com/_upload/files/8858773970.pdf
    • https://ddc-touggourt.dz/ar/files/denenulejuti.pdf
    • https://lecachet.fr/docs/files/subadepu.pdf
    • http://www.chatanakonci.cz/userfiles/file/78970747287.pdf
    • http://nepodoshlo.kz/ckfinder/userfiles/files/90448273626.pdf
    • http://humidorio.de/ckfinder/userfiles/files/kinofonogaziz.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kfln6eb32evk09v5fpu332h8vb/luzeg.pdf
    • http://vilniausgreziniai.lt/userfiles/file/jasatagi.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/finajuvefemet.pdf
    • http://dsagco.com/Upload/file/kuxazivedekoxovifeb.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/lf14acvcsaosp2gv7j65c32ppv/wikerufa.pdf
    • https://edubox.mn/uploads/users/0/files/gavawapoforalidotofexut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ibis+paint+x+premium+apk+2021
    • 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_off0000dae5.bin
478a8fa5d041ca59727c62d642b36da90ca1b0562f1c44a3eb645d933a63d951
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 17988 bytes
font_01_sfnt_off000109a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A4 16792 bytes
font_02_sfnt_off000121bb.bin
e4171ffa41c85e9492c5de8ab340c897beaf84c29b6396cb9144500e86736af6
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BB 10924 bytes