Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd032dbf83daf5b5…

MALICIOUS

PDF

110.5 KB Created: 2021-06-23 20:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 664faec2f568a34ccc13017de3a8a217 SHA-1: a8ee06ed526c3d1abf9a2837a0e4619f4e91c69f SHA-256: dd032dbf83daf5b5e48c8510ac6baef28e84e74e70a00e334dda0199590bdfb8
154 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The ClamAV detection and ML classifier indicate malicious content, likely phishing or a trojan downloader. The presence of multiple distinct hosts and link farms suggests an effort to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/331e7d8dffacdff8d079ac496eeba0d4/benimidosegesuluxe.pdf In PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/digufewujiviravedalufifa.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093fca86c776---59513055161.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ecb27e6a8495a9820cadb5621cea4c36/61156872376.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7e6f48bfc---53453805807.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc2c97f06---60653265721.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c10im1pnd8122k9v9j2ibgbpd2/60753121744.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577d9b96e2---nuluruv.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/25ceca7a017148c7c7b1250426d62e4c/zopaxumukolurid.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pcs49vpd9s7bo27ujqqk4lji41/jodezuzudosumasewib.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/vegixizilufuvot.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0cd48e8e8c25b2e2daf670d895977e89/39298189576.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/vrkmpitobbet8k6ua4q9v9psml/19375604922.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106c9ddf33---2609522786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+all+the+achievements+in+cookie+clickerPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000195ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195AC 5388 bytes
SHA-256: 1f5ae30e096741fafc0389f765d3a5ea5d02c0c4729d37feafce3107e57629c6

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