Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85ae79f8594cb74…

MALICIOUS

PDF

92.2 KB Created: 2021-09-01 10:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 537b442f3461c98683a3aa36ecc51a96 SHA-1: 6244c8bbde03394f4ba779cabb8a9649fdc2b018 SHA-256: b85ae79f8594cb74634a4d071e8c8e09790c00d8dbba71e2a46f3718e84e26f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and trojan activity. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing pages. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pixomot.ru/uplcv?utm_term=best+loadout+for+zombies+cold+war PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db56e33349b---xobotoxaz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3512b906c---vabafa.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/lgie9pks3l7eg5ta9u3ga5t1ja/37900879596.pdfIn PDF document text
    • http://aplus.to/userfiles/file/29924852536.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xuputalatuvaxa.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/dalizomasej.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8304e50ad---69293241064.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/10401964392.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/b2bb69bc752f8bf0d10baf263e4a16c6/jevolula.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/tenutilukagibukilizijed.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083385ecb122---wibojajexo.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3bedc101---mufanejoba.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/71864801984.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/bezemetavoz.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/fufejosiriwotutolabufo.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/sumij.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/11206558595.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/fokirufefoxalo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af1a1759465---rurekodafusemodiput.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/66234599060.pdfIn PDF document text
    • http://lejuriste.ru/files/file/jibemukusunufado.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/24c1cf7608c26292ee55e411646a8b91/diketasug.pdfIn PDF document text
    • https://yellowstonewildlife.com/dugix.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d7d18c0---93413162324.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_off0000fe7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7C 19044 bytes
SHA-256: 13922883c39571354233a21f1deb441b28104f0811f139f1543adb7163a45180
font_01_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 10972 bytes
SHA-256: a4a9bf89952c93011d3059330fcbb14d7e5a187483136b3d0f95567f53a2cc63
font_02_sfnt_off00014915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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