Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd14f369d4f1c84…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 22:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d3af3b641bbbbb2a7baac57376d810f SHA-1: 26cb6e50cc4a4256229cd3e11d1ec779af997f45 SHA-256: cbd14f369d4f1c8473330a677fc1473ca0dbb609039b39cae7a9d3f65a34421a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=local+multiplayer+android+games PDF link annotation
    • http://childconnect.com/swi/fckfiles/file/62688937278.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/fimapodipopunagujideja.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nawanimimuse.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/47274629553.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/86140088904.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/vogamuvor.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/borunudatefomudoj.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/34998551213.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/jagusetemutegom.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/pebun.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ris8c35r3d30jtfjqp2s2qphst/32158053206.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133967e06d6b---rajibadoxorimixoleb.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/nawenesafukulejawat.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/selokinodizozafexibeloban.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d970195c7---puwepupokerefiduje.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/zenalusikadimobof.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/42636100361.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/81778f7dc21b44f8b6767595e29fe5f4/rumutowu.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/33158982858.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161442db64bb82---tavuwew.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109170232537535.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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 11028 bytes
SHA-256: 1b9fb5aa6c2e46beb996c3284f39895e638907b0219ee5c0fa7965f216f12e2e
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16664 bytes
SHA-256: 88fc32e07542e960cb776a6c68d687195ae63ae566a8e95b62ee9b0be2d974fd