Malicious PDF — malware analysis report

Static analysis result for SHA-256 acee794fcc7ae8f1…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 17:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de7e8f354761a179c7b18bbc06c30961 SHA-1: 9841322e738628e3b157d17cd3056558be9d95f2 SHA-256: acee794fcc7ae8f1c6b33b5b49da4e1ed0cb27b0d819cab6b4d313f42989da78
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 the document functions as a link farm, directing users to compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://archism.ru/uplcv?utm_term=electron+dot+structure+sulfur PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11cee1fae---56461541244.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/vipenuzuzitapuwevujufaxu.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/62749574474.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8c79e27c9---zilemixixugojojipojidu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb0724524d---75144240388.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/p1sd9vfgaon39g5sanervopoh8/82127952327.pdfIn PDF document text
    • https://camelcarpet.org/d/files/limed.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/fegobatiparuwuzajebat.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c053185c70---wikus.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/70181823026.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mewawuveviwowemetiwuwozer.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/pibumunemogaxoviwejew.pdfIn PDF document text
    • http://riversedgefm.com/files/file/deziveteba.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/3492711176.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48b06b0a8---guzegezefiwulavugovoduga.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/gisavepurabumarawinage.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1deaadf0cbf4dfc36742d9726f739c26/jugonudiwelagikoju.pdfIn PDF document text
    • http://immopolignano.lu/images/zogeruvowoti.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/gosunakozugakoxexoloxo.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/melolumelozipafowisem.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/xutilixegiteperukixofevav.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b39e23a4df4---bunagaxezit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE784 17008 bytes
SHA-256: c337f57927a258a9b5b61fad98e7fa83f6f880cd3f11e739145b0e069894aa39
font_01_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 10300 bytes
SHA-256: 0cc3a9d3fccf648709da66ba52a6a3bac2ccb1201cd897e774241772484c5532

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