Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9ed123829bc898…

MALICIOUS

PDF

86.2 KB Created: 2021-07-18 17:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5251b6f90a85b242d12f1afeeed78911 SHA-1: 5f37945e08c1fcc8767593e635de94fefaada299 SHA-256: ab9ed123829bc89836b665e8ee5c261229d969e55d437a4668557d36c3085eb5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kq7b621b2muh94renk0kqheg9d/zemugefijibukowe.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607604328e53a---sutufeluwafelorana.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/fussbb2rpf8lvafhu1s5gjdcp6/12936537722.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/38863260060.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ef99497dc---wibutukutefadotoxeji.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jidbe3c2gq1ffc56c2jc3rb968/24259658118.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/501700e8b0c631e1892df4c13216d5ba/bukubisakesopidewa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/cca317g859oun4uo561fhmria1/25795270765.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/86229640929.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/30554851549.pdfIn PDF document text
    • http://agro-partner.com/Image/files/76735754575.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/adad25c6ccdb0d035ef392c092ebb65f/46060062766.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/f5360e5d4756f265e02390997dfd41e7/72729856228.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f26b682e3eaff794a9a820d0adc70842/tiwinejeku.pdfIn PDF document text
    • http://amandamaitland.com/images/file/36917843462.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/46c37242fe700fe7448ceb5c3004b657/wizoboposor.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0573bf89abe034c5e5e852fa11d06eef/73668657099.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a106d7312---fenetawizagul.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/eb018bcb2216d6c503f5b2d35ef8c7cd/63389854016.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/95973471204.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cia9ctdrdu0e26m3i57lbd56v1/jononusujepeviwudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=caitlyn+jenner+and+candis+cayne+marriedPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10688 bytes
SHA-256: 3cf15ac0b1c0c8d283761b9197eca1f3b0d03dd7f74d6a962402c01559a18068
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 17072 bytes
SHA-256: f0e29bda4d5f6956059731405a12dd6e748ca92c2ebbdc2e61a3900369b40e8c
font_02_sfnt_off00013199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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