Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75d06d4a5e364ef…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 05:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56dd74cf16cf98629a1d997eabd8997d SHA-1: 0326608c13e84de29ec49a7fb76aeda17e5e6a12 SHA-256: a75d06d4a5e364ef1a1e4794952f68f82d4fff332cce170e06344c4f66cb2852
156 Risk Score

Malware Insights

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

The PDF file 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 potentially compromised or disposable hosting. The document body is unreadable, but the presence of many links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2a939d93---nikenosinerudiwakerinega.pdf
    • http://dison.cn/filespath/files/20210911160516.pdf
    • http://gzafjc.com/uploadfile/files/bagawoso.pdf
    • http://redigonda.it/userfiles/files/91302089922.pdf
    • http://studiofantino.it/userfiles/files/wivadapanolaxelovar.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ck88v5lq1ve6vu932sgnjch40s/warikefojizow.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/75953486016.pdf
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/xutegidosin.pdf
    • http://evolutionchonburi.com/userfiles/files/81158399829.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/4283241374fc7599789c35e447eabe67/juzor.pdf
    • http://cjmfgx.morefriendship.com/upload/files/83352909579.pdf
    • http://box8websites.com/ckfinder/userfiles/files/55217367547.pdf
    • http://umffz21.ru/admin/ckfinder/userfiles/files/siroxi.pdf
    • http://raylutickenterprises.com/userfiles/files/vidotejagijupilalaximup.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab133b0e0---62642005061.pdf
    • http://veewood.com/file_media/file_image/file/87113883307.pdf
    • http://media-production.net/admin/ckfinder/userfiles/files/zatezulopodezoxuj.pdf
    • https://rajaunited.com/contents/files/jowejimidozezugovolasob.pdf
    • http://whipitleather.com/userfiles/file/zivoxatap.pdf
    • http://orenprom.com/img/account/file/didasixutisekisivuwi.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b46318003---92024765491.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/4090137151.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/tapaxujazadus.pdf
    • https://readandenjoy.ae/userfiles/files/19670558539.pdf
    • https://gamaconsultores.cl/upload/file/pasezawitawidugubetakip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gulliver%27s+travels+illustrated+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_off0000b1bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BB 16792 bytes
font_01_sfnt_off0000c9cd.bin
e7ad3772af54ee2874f49bf14e576cf0786f142e54e4e908529b0d86ce69afa5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 14924 bytes
font_02_sfnt_off0000ef78.bin
9cb9b18e75f93942e31a6689b1a12b64736bac5f3611546a064a79dc90107682
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 10508 bytes