Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0af758d93ac011…

MALICIOUS

PDF

77.2 KB Created: 2021-06-30 13:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b199b517d6533a4e8dfb61b63e9e752c SHA-1: 78a84d758a62f9231ed0a8db39d13b80c89ab27f SHA-256: 8f0af758d93ac0112a1599dc65f14efa745d540edfa0e5ec8592dbc71c702818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://catamma.ru/uplcv?utm_term=public+administration+in+india+book+pdf PDF link annotation
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vukexirop.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/47857945416.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210601_204414.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/12109014062.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4433513b03---bupawo.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a334129bdd2---42752443231.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/78016073479.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/51691154558.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095791d60262---ziwojefabutelat.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/61231141350.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a222030d93f---31007271789.pdfIn PDF document text
    • http://metallpress.ru/files/dumujozuzu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5f9f3a3763fa8ddd5f032ae4ff9846f7/2685256646.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gebikibisominupok.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096d02889c84---61504397278.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/17719866992.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bkid9dcglu563dfsaj8q54cdc3/147693434.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609080016dcc0---fubuvijofelebab.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/gizadatoberosozik.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/94263536534.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c784121bd8e---gerisononedibukemerakilor.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_off0000c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 10980 bytes
SHA-256: 00f733484f7b1e83f344fee3b92265a08277fdfaeaa1515892e4fd2d59eff6c2
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 17532 bytes
SHA-256: c919b9f460d841a1d796dfdd43de0e3ce8edfaabd3c0a293824c3aae0690a5e4
font_02_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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