Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c4f1ceae19cb4d…

MALICIOUS

PDF

88.8 KB Created: 2021-07-21 11:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: edc2554ec3c9911290df34aa4f0cae6f SHA-1: ef7d7121822b128e02f3ed2db61280c71b84fd69 SHA-256: a6c4f1ceae19cb4d18973ddb9735d89cd2ab3c037365deafe4e88adbd4c624df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607932f06c8ac---80978381405.pdf In PDF document text
    • http://biurod9.pl/public/userfiles/file/putotuponugu.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/67459751683.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16087f78588985---goxaduzedifesud.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/7263152741.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/sazajonebejorilopaveku.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/48558883447.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700a3511e---pudofajetasamabedibew.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/gerujeteladevivamijuduxi.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b186658ae5---18399618320.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/wovewu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/51fb2193d8ab77c02398793ae324fbf1/99645473342.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e02277725---48290808891.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609690ab3f04f---69717318551.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ceb6dd1cd30b24283fd1a7bf7dbda380/vijelinofa.pdfIn PDF document text
    • https://akemi.ro/hirek/file/14520856534.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///bogakasuwubot.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/049a0833ee424bd999f4d798f1406a22/73392547113.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/46509355099.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/50612957811.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7ccdc71ba1a6c8fa44c78a242610afa5/64825252839.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c00666602---45851869202.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033f0235b4---17964685634.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/949eb6fbaf3b30f03ae092ab85ac5611/ratovep.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/towivowevexukififanoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+many+0s+in+100+millionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 10304 bytes
SHA-256: dcf02aac31faac3b9167edf22331685dffcc29e85381fa54f4782c9be4c15ba2
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 2312 bytes
SHA-256: e1ea04c6d02515f9ad7edeb676e0dc705abaf62d1af1990fcbf06ce71beb0d01
font_02_sfnt_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 18200 bytes
SHA-256: 028045733d4baa95d68cd5dfba04d3a086c59d29a1b5ad97b727597ab559bf5e
font_03_sfnt_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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