Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c892e21f7e6c617…

MALICIOUS

PDF

69.2 KB Created: 2021-08-26 14:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb0c810db6ad8e0cdf24e5c1d8022b10 SHA-1: eadb1600b9e74578e93c40eb952dbdb346742465 SHA-256: 9c892e21f7e6c617ed705f2b9ffa9483c6712f8de7250315083de84934838016
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5560

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=montag+and+faber PDF link annotation
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/67035265181.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/solovozitijupobabexi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608d88acb7074---tubebajosafubumokejodut.pdfIn PDF document text
    • http://parfumkin.ru/files/files/22543638997.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/97280925292.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/pu6u9csjg8t5oepub95supif4b/59464733512.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wujiguj.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/misoxirejivadedunif.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e29fd27b9---14993427386.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/xabudakujorezaxuj.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e7460a91a06c10f0b1030ae4757f42d9/tutagelitudulozo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/7095299433.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mosubupad.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/74810845191.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/nikakugikuvikezafejujej.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/21856213707.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/zibuzubawutinojaku.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c95809d2e2c---rupupejajimunevaxuxala.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/27103027907.pdfIn PDF document text
    • http://aven.su/userfiles/file/kisugenivaxuj.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/buvapegomuwojarifosasul.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fbe1d85562aab5206bc36643dd052fc9/68161212091.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/luvetevezosi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 10356 bytes
SHA-256: b4c147fd28d17da735a039b96006845f852e71356247ef51cc0946dbf719ffc7

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