Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6db1f36e468b475…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 00:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e247a8ba25e6ae054e7d9942cfd96f50 SHA-1: f9ab58ef70c54a795dfad6cb0ea88f33e8849112 SHA-256: d6db1f36e468b475f3e1a61898b809786b0cce273724f8dc643d344592e21bef
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://geometracosentino.com/userfiles/files/81514440942.pdf In PDF document text
    • http://gloteckr.com/upload/editor/file/67997794615.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/wowede.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/89861142582.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffca2bafc---65421724209.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/verutolefadosobu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614228c7cec7b---57389817397.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/duvukinejoxufi.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/49186130908.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649ad4969d---dusonedidiresarojipitu.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/ladorexeninekutop.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161322d3863161---39855846113.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/42951827867.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a23081305907f87a6ba909b5d328bb84/rirefekuwuzilod.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/42441608352.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/fekapoguboxi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2fc8b90aa---pezoxafaxobopegi.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/dulofekumukipepibupek.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109100956171346.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/39790984522.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/88482481426.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8984109e---sazebew.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/raguwadisapuzozugozedar.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffe8ec81f---rowewimamolupagizevun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fancy+pants+online+gamePDF link annotation
    • 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_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 14888 bytes
SHA-256: d1a4f32f5369f5151d1eb53ccfe6f0f15989de005e6f00acb10421d7e5fcb055
font_01_sfnt_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 10708 bytes
SHA-256: 5788a94a2b9836865f60b1f344a6e48ceeed2c69316faa9064310e8c26d018bf
font_02_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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