Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcba299b8b667fd…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 06:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1f724eef491c810eff2e01c613fee0c SHA-1: 92692c9d14ba45bff43de2f216b387486ee3ed1e SHA-256: cdcba299b8b667fda75b581ba29885e62285333ec31cd59bf157472fa852871b
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as a malicious PDF, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=armitron+watch+instructions+wr330+manual PDF link annotation
    • http://budoprojekt.eu/obrazy/file/61623655283.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/bidele.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b5eac757---novebejosujazagomamatigud.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/33261226725.pdfIn PDF document text
    • https://braus.uz/images/shared/file/44884985616.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba86a3f96---pomunej.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/6502057901.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/61079559874.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16107b6f7996c9---xerujud.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/daduzave.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/sovuxegolovuzawitejapos.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/001u1ofevdreqrirlt3nipnjau/loxaxujew.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/96d13de30bb5544a5682002e53b795bc/bobizujajufasexu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160779b411d126---muwukuretuzutogidifazemu.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/96046478278.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/0vrq393ea0giucgibi2kov0ep0/60773549829.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086e96a196c2---nubufodukaki.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/2894284606.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/c38b4e6hq53cq1vfkufmpjgfc4/fuvexozumasuxak.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450f22383e---rafun.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pozunokapuneze.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/nag90jbbmj51u6dgf7fspm85k3/jenikim.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/64395355601.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/runudalurog.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/zugetu.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70571083324.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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 10824 bytes
SHA-256: a9ddb7078ff1ee4aa940398451e15cb4dce74f452e655c5e82024a8c2ad27a82
font_02_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 17336 bytes
SHA-256: 2ea3a5d98b22b32581ea316842b02e32bf7bc08853a7e39c406c3ac301381785

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