Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb361aff291e27e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 00:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f2913515451ad65509a8f45a4736d9 SHA-1: bd8effb73e5d674169c11e4ed05b0efbf0865256 SHA-256: 3eb361aff291e27edbe9b36ca557a3016435f59d2c8e27268e3346d2bcc5e34b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external PDF files hosted on a variety of domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests a link farm designed to obscure the ultimate destination and potentially exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=story+children%27s+book+pdf
    • http://hyundaidongdo3s.com/images/files/fodolazate.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/80948022923.pdf
    • http://animalscipublisher.com/files/upfiles/file/tozusewes.pdf
    • http://teplorium.su/userfiles/file/jiwizazefumatuxowisaxig.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e1702f277b5da2b530c336d80bbc64ad/wenimogiva.pdf
    • https://bmw-zona.ru/uploads/file/muxusubajap.pdf
    • https://topconta.ro/userfiles/file/1988016932.pdf
    • http://occahomesearch.com/userfiles/files/dorugim.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a2059220---powuzupitu.pdf
    • https://weilmclainboiler.ca/fck_upload/file/23408383404.pdf
    • http://veraschwemmle.de/fckdata/file/dapetiredabo.pdf
    • https://abzesolar.com/uploads/files/50042945348.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/93690381194.pdf
    • http://besteva.com/upload/files/pagiwisivisijofetumema.pdf
    • http://krakowska98.com/zdjecia/fck/file/50806981260.pdf
    • https://mudraconsultancy.com/uploads/files/mewezorularasivezadijolu.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346967374e4---15146942632.pdf
    • http://machinegroup.ru/img/outer/files/54823137733.pdf
    • http://rovitek.com/userfiles/file/94960252155.pdf
    • http://panova-art.com/files/file/73176482039.pdf
    • http://oshcongregation.com/userfiles/file/gulunuvusivewugaporujexig.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210903_59D6244F9D697106.pdf
    • https://rajnnuhiddje.se/userfiles/file/48757295172.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_off0000bb9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9C 16792 bytes
font_01_sfnt_off0000d3b3.bin
ae5cfbe68d46e98de31e76b9f4b348ef626834410022e573f9ebf3d53c84365c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 11012 bytes
font_02_sfnt_off0000ed06.bin
2fa8e265ec7c0d7098c7cf9d29725d3f7db62fb8d19fe1a0463bb693d1a9879e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 17320 bytes

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