Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39128b29105b768…

MALICIOUS

PDF

82.5 KB Created: 2021-09-02 21:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6debd247d1d9bcf4c558f95989e4d30d SHA-1: 257e07d836b2653ae9dcd9f266bf27345630fd77 SHA-256: e39128b29105b7681f67129dd81854e4be77a0b866ebfda82cccf6d7ca94f3d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to distribute further payloads or conduct phishing. The PDF structure and embedded URLs suggest an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6baf44f7fe---72302268793.pdf In PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a3d8d506d3ab6b0363ef0b1ed21e7c7d/65519359518.pdfIn PDF document text
    • https://stopserv.ru/files/file/4355855457.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b5d850d2---25718735619.pdfIn PDF document text
    • http://contelex.it/userfiles/files/zukoxoruzevanimalikigox.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/gonidejisulavobu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c076fe1354f---lulelasodedirud.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/1694240a86bbbc027daea4e94bcd013a/jopozobezovuwure.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/99884619632.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/9697953932.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adccbdc6c1b---mijalutetesijiwop.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f1c8a5886---feboga.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d79eef5bb7188d531748e3906e0934b0/senigukofesajivadib.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ff00f3ad086acb2b9d2a4b604ddcb84/paxetelufomavobud.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfb14e515f---korepalojametikufipaxejes.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ff7aee2---19225041580.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f65bf3d05---fotiwagozakiveganobozasej.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/rawefobujuvidirinojagolof.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/79880287160.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/5294222450.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/pamizabebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=traitement+sinusite+pdfPDF link annotation
    • 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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 19488 bytes
SHA-256: 9baa75d96c9a515564e49aed4e5b5bfcd9e06817ecb67ca468b2a64b96988e99
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 10556 bytes
SHA-256: 6c06e1580f8f4811c6d4cbcec0f1226433cb2284081b194e15e0662f113dcadd
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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