Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb9fd6dd64d7bab…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 10:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b61d6384f083b404b98f3bddccb67d0c SHA-1: 34732c280168d257b8f70e1862332778246b7ec0 SHA-256: fdb9fd6dd64d7babdd9a0679a01bd6d53e4216a39d28f46616fdc101924c587e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d01fafd3fa64b20c4aae39190c8e350/ledowid.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2c770311---vekalepebijojag.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/48197467372.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/18277272452.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a434723a117d13f1cac4eeccba5be1d7/44239675270.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe163b46230---71192673996.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9a9q2gba9uaajnmq5lndun5h4u/pazenaneroxuxed.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/60289320740.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/962fe796a755dea3de54951190c6ddb7/mimamopukagi.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/9f7adda04a74ab8a0d48d9ffa3a122bf/xijoj.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/besobisa.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/55300164038.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd61b2125e1---38747746689.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/sisitetoralafuxemamazamob.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/89467082239.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe019e523---41941138218.pdfIn PDF document text
    • http://rsst77.ru/upload/files/50249203701.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202108190158097703.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdba13a24be---fupigavafozasenozer.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160881c2d86d06---52423710706.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/59833855162.pdfIn PDF document text
    • http://pneusmarene.it/images/file/minuwusafixoxuwuwejefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=digestive+system+of+earthworm+pdfPDF 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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 17564 bytes
SHA-256: 8b84608e058e254af09cd585e57f821b333fd8c7a1aa37340064b748c3eb98fa
font_01_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 11060 bytes
SHA-256: d688eaf1e45f0cf88661abd2a17949057b9ab7214dd11ebe172a1b1ce6f999d6

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