Malicious PDF — malware analysis report

Static analysis result for SHA-256 219dba980e61b384…

MALICIOUS

PDF

68.5 KB Created: 2021-05-22 09:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fb0cef34e3222db206b08e6d7c70af5a SHA-1: 743484f4947ee5d08c15b5e348afcd02ceaacd7a SHA-256: 219dba980e61b384caa4b02adf7302afa243b7e2bb6adcc5f7ab8c9050398b9e
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to host and distribute malicious files. The primary URL points to a game download lure, indicating a social engineering tactic to entice users to download further malware. No scripts were extracted from this sample, but the structure and URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=bow+and+arrow+old+pc+game+download PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099cc0828e3d---15632841401.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/f2ee51f7a645fbc478bf3b0a8102d02c/kebexob.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/sijuwolezukipaxuxi.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210515080421.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/45739112714.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0a833vlr93ijki04jko8m30if/ditijexedolozebaxulazix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075159e0b891---45036258997.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/v4qbhe6fqp07ftqve0kj2h3het/77072150597.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d92sqfen1vvn7cflbroa2gafmu/rumixojoluxisozovise.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160815e6a911a4---zuzalamemu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608522a706b7a---memitefu.pdfIn PDF document text
    • http://amdind.com/userfiles/file/mafumomagomisijibe.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/9a7be39988b0ee2743c3ffe48116a599/miwefukirelefe.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb18cb0694---51991709271.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04be6586be---19265116399.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609443122b287---68458378183.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tifimugepaxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 5356 bytes
SHA-256: cee679e5669327c30eb7d6e0c75c9847d8b358831dd25d8b9bdd2cbf1cf3ccd5

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