Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cd4e97701f6041…

MALICIOUS

PDF

88.2 KB Created: 2021-08-01 04:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 444d3e3955bfe404a5ae47c2cd87fa81 SHA-1: bbfa28ac5fcb30e38f2b61b4d00469b87d283578 SHA-256: 39cd4e97701f604112c6a4c9e613bd8b73cbc83f93b2eba8db52c4fef95ce61d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other domains. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://angelcabrera.com/FCKfiles/file/fadowezovosobosif.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/sususuwojonalizoxorabapal.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b22436ae---68718085008.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078e55e4f0cb---dokisebatugo.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/j48m6pc08cudqhbgb2du3s6aql/lobijoxe.pdf
    • http://pensjonatagat.pl/userfiles/file/selevibunul.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1620611031496.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ecace12f575---relusumijuno.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/jhim01dm8v3sq8vl489ltjch2l/20446903936.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210728201548.pdf
    • http://chinazzjx.com/d/files/pesudulimibute.pdf
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/50017239803.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/s7q5vapn1arve2ufja58pnaua3/xozukowanobukatazawuzulag.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f10b2650a59---54303032685.pdf
    • https://vnsteeldetailing.com/UserFiles/files/refabudikuzulitaxanoj.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/d6e99bdd94fb88a207f51a3d85835d65/56535403803.pdf
    • https://aluminiosarla.com/userfiles_arla/files/ragubegexoj.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c3a8696e---lijojubojumajeko.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608717fabd357---lunuzuvifozozubux.pdf
    • http://painttechvina.com/webroot/img/files/44875259383.pdf
    • https://creteservices.com/FCKeditor/userimages/file/nodabanizunij.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783af6d2ca---faxalasawaraz.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/6o9hu3v0jtc3hp8glnrb3cds6o/veworif.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a79d8f75f10972c7f06658b29c284f6c/zebegorujiwavosirabufoxe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cablage+electrique+interrupteur+lampe
    • 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_off0000f332.bin
9290e50030ddb3c32f7108eff96f53747aa5f0a4c7ccdda027f54c63f86e02e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10844 bytes
font_01_sfnt_off00010bac.bin
f3ba37f3cf2454b685e49d5c946266083724a13a2623e7009ad2665342eee600
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 18356 bytes
font_02_sfnt_off0001394b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394B 16792 bytes