Malicious PDF — malware analysis report

Static analysis result for SHA-256 709ea4e2c2451a6d…

MALICIOUS

PDF

107.3 KB Created: 2021-07-29 19:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8872d51f08f623ff9a0c3abf9aadfbc SHA-1: 813ed9485044ae861ade7ebdb9c951ba668986c8 SHA-256: 709ea4e2c2451a6d12dd31d639a9ce7d70a3a68575bf5430f98d8b7bb20248de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=best+west+coast+zone+run+playbook+madden+20 PDF link annotation
    • http://www.dkmodels.net/ckfinder/userfiles/files/50230289628.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bb3f676ff---javumogixuxodujox.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/lomaxikabi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/3471830276.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ljdud166skak0u3kmcvobro8i0/92921483598.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/6c73c6ecea729b763a427eb023851d47/86845610566.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8be96219800964e556aec5c0afffeed6/47304015597.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/kadananite.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/e6f883be1d5fc4c517de1c0116643cd7/xezasaratem.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/dojidufisoresixu.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/41775944557.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/idmef1jgsdbtq6lgo4b2rqpnc1/sofanifevu.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c0f22bf0a4f3a29512b4db559fc47a01/27525066160.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/36124071326.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/joduwere.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/subupibixolixuwa.pdfIn PDF document text
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/ridenuwufuwenab.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/79992274736.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/90702023024.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4448636f---52336028541.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_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 11468 bytes
SHA-256: ca4afa2c2a7bfda8ff288831a68df9149472685b35698867ce35bc69a3651751
font_01_sfnt_off00015a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6B 17244 bytes
SHA-256: 2ab3eacf996014bd7c4da64f529ceb33d4f01652171420358029cf409276b90e
font_02_sfnt_off0001879f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1879F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.