Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a8973cb0c01429…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 09:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8afc3d587fc783e5daab1bc7bc0f7fb5 SHA-1: 6a56fc07942dba256930ab7d42d29ec27b077594 SHA-256: 29a8973cb0c01429bfef1ae3ef4163bfc28860dc63e235ba21761786a4e5d881
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, including one pointing to a compromised WordPress upload directory, and is designed as an image-only document with a click-outward action. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=roblox+god+mode+apk+download
    • https://www.aukuras.org/ckfinder/userfiles/files/talede.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/aa38ce6b667edb7c82eeb5fea202f07c/53775555494.pdf
    • https://villadorottya.hu/uploads/frontend/files/16579241494.pdf
    • http://wamer.org/userfiles/file/kovizomowisesodisokukar.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/37664285121.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/49389918532.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149808b49fe6---ruwegepopifiz.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/vasejalapezazusefevi.pdf
    • https://loyallcanada.ca/editor_files/file/35382567964.pdf
    • http://enjoyisagenix.com/ckfinder/userfiles/files/6896527334.pdf
    • https://univerosg.com/ckfinder/userfiles/files/98372472496.pdf
    • https://canionglobal.com/FCKeditor/file/xutimorixekirinamozepap.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/32920368102.pdf
    • http://laihoawedding.com/app/webroot/upload/files/55520775013.pdf
    • http://seghers.kr/data/editor/file/100552072161318c69d719f.pdf
    • http://studiomuraca.eu/userfiles/files/kewogujatewizeg.pdf
    • http://loveperfectionschool.com/upload/file/gotuniji.pdf
    • https://geniodelweb.com/file/nekofixasijovozenala.pdf
    • http://utuin.net/files/fckeditor/file/22927986694.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613634f03f80e---mozasibekolopejokakilelu.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/fecdc29f61cad65fdf3f6360c000f0bd/kerip.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/50141898313.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/39803050444.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_off0000ae3e.bin
18a72ff50e8fa7edcabd7e5de1d53c96929fddb3407b9c1e593ae506f3f4b98f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3E 13696 bytes
font_01_sfnt_off0000d03f.bin
869a05459ffe6a54d75804862114df633e5a8e40f908401dd1f026da95e111ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 10744 bytes
font_02_sfnt_off0000e893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes