Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd304b837a2acc59…

MALICIOUS

PDF

90.8 KB Created: 2021-07-31 16:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45cfe3498fe616e66c55de0a3ef9cb7f SHA-1: f24744df62ef12a4dee5943a8f1ef99014597bf0 SHA-256: cd304b837a2acc59bcf5309864f8db9de38bda6703a5f8874fc7e31f2a306d3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://inwebjor.ru/uplcv?utm_term=stream+of+consciousness+in+the+wasteland+pdf PDF link annotation
    • http://quaint-house.com/8139264794.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/lutupelugeg.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/49959295997.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dunalewatalupe.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16070d493babcd---nolunemegimozaxomop.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///74613678969.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077f60aafac3---1862897927.pdfIn PDF document text
    • http://htcable.cn/d/files/tukasokanibizunuwovuripaw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf29df6f2---vonumoturavotiwoxo.pdfIn PDF document text
    • http://klefmarken.se/upload/file/debenixusoruv.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/sekevenerapuzozerufuzukip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f37fda77e---87955164592.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc73afd64aa---26037990512.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/19113651813.pdfIn PDF document text
    • https://actor-conseil.com/files/file/nuzubelokovapamuzu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5d97a745---20443112483.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71f3ec533---jaxulilakelutigakorulime.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/50861819229.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/69228163830.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e5ff1475a---94178696070.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ea05fdd9---77734255863.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/bobekekibilife.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_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 17004 bytes
SHA-256: 6f34a23fd6808a00654fb59d738d6ca3f140e48ea0dee54fd324e6a056fc4d66
font_01_sfnt_off00012ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F1 11148 bytes
SHA-256: e5bd35044d5e6b55c1482c0859bba22cf4ebb2bce28b0511b719872e05707409

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