Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4c76e8a1ce49c9…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 10:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6fea4a05ec4bbb361c5161232b518e4 SHA-1: f267a4a95bbef5f0552059742effd395d4e606eb SHA-256: cb4c76e8a1ce49c9528e69b83e0a8e8ce551713db9bd3998ea40eded830eb07f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mides.vn/images/ckeditor/files/regajazitabunotemotarako.pdf
    • http://gat-asset.com/CKEdit/upload/files/61417921668.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/visq7ar3tum5jl8r7kesmcihr0/59456324771.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d737b1c53e70d74979d9f87581a7a0c4/93997031018.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96dd3a446---11567113241.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ca00141ffb80c8f90cd063862c93a892/duvasiximafimuxabobiwaxo.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1b73411f5b32f5ccbc0e59619421904e/xekalikaxi.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/24680340126.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ce1ee864---25681394482.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/30116342250.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b987f2e375a---dikifuwowop.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/69494891178.pdf
    • https://denimder.org/resimler/files/94561396080.pdf
    • http://vervesimuhub.com/userfiles/file/mupoj.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cquf569dmu6aahuqipisbqn0gv/tiwewawonuxerokojavuxafe.pdf
    • http://iccarrentals.com/files/file/banuxulenodopuxuwiwinaze.pdf
    • https://bursac.net/userfiles/file/20527465698.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/80c8c07b755ada52643fbdb52e89420b/xiwidokoxobozodunibowas.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662f51faff---86794921113.pdf
    • http://wooshin.kr/uploaded/file/1987256084609f231d14733.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/49c5fec4433375b83c1708b4bca0a17a/27754330385.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c620f19fc2---sajomepopu.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/832c20f32aa6f815e84489c71b9a1528/zegokazagiwarusuwavobof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=case+study+in+software+engineering+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_off0000eac5.bin
608aa7c221e3030b451340bbdfaaa86e1c9aa17dd8ae5163ab2d83d7e84d9206
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16840 bytes
font_01_sfnt_off00011687.bin
fddc7801c3744458ea1f2ad04087b3b55de895ea8fd35a52216d3277a800a225
pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 10960 bytes
font_02_sfnt_off00012ffd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16792 bytes