Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05b37011b0b653b…

MALICIOUS

PDF

94.7 KB Created: 2021-07-31 16:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da0b5fa5539c1bead477bb88008fd746 SHA-1: 2ca1da539035d38017c1c5c4255022f2a8a1f5b6 SHA-256: c05b37011b0b653b322efa88fb7811d28f8d0c051b3e7317c488ce9c25a91cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, a common technique for distributing malicious content or directing users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to compromised or malicious domains.

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 http://www.salpasafarit.fi/tiedostot/files/gavebaxid.pdf In PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/8926365773.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/93ca9ed21506176bf07be17ad0d6e647/telasidakoriga.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb9f8cc272---dubotomugilobaromuk.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7405ef98a---wotomemugetuluvururuzu.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xurezutopolatedelilozituw.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/vujufurosavomojiju.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/17238759312.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/reniroso.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f84e66eba4---78495323668.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b35c316474d38411f10c001fc1e1e502/zisorofenanekejodovel.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf01270a71---71435056652.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/81255977818.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/filazojirujuniluvabez.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27c248ab7a---55269068388.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/vataguwalogap.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/supawatagariko.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c662ab757---68804862895.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077578ceca95---mumizagilerug.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/punuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=28+creencias+adventistas+para+ni%C3%B1osPDF 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_off00010c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6E 17936 bytes
SHA-256: 0f900ce0ecbd934561f11f1d48b9bb5d08cd5577f4d095ec13e2601603be7286
font_01_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E3 10964 bytes
SHA-256: 45d3e19b663bed128e0d6d48dca52034325e5e0e8dda3e2423e891ad35a68fee

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