Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d2fec0a8a00d2…

MALICIOUS

PDF

120.7 KB Created: 2021-09-02 21:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03b9b83b9fdd669d89e97bdc0d828889 SHA-1: 1e85cf971f57ddf23182623a9ad95752e53b1df5 SHA-256: ed5d2fec0a8a00d2f61d5250a7deeed7f8f5f22d92749e614478e08856657c93
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072429a16097---taxabege.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e8a8c4fe8cb895e89f5b8752bba0dd22/xarimuvaribapixuxewapa.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/4b39e5d4c55595afb42b3c79c10941e7/jerix.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ae62eff8d---powoxotiwok.pdfIn PDF document text
    • http://schokofontaenen.de/idata/tedodupuwemerugo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/cbb2c848e9294084af66057583debc7e/rowupadamemufikenotuj.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/812312767.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c110148877---5221428881.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/lunetajupugafitapuf.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/16215384496.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/65331531997.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dae685ec23579a1315a267ca04d21ad8/50580592346.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/79636233480.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/90250536795.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/51392463452.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/nigunasezuxonemoki.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///26651035003.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/18477667150.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/wafeza.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/30065100400.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/pakexaz.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb8787e0f---70672495700.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/panudej.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c244787db---80000233325.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/faxigarafoxijotusulevuko.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a679e442b9f---13663349560.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/pevunenupuzukolewij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ghana+empire+pdfPDF 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_off00016b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001836c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1836C 10368 bytes
SHA-256: 19978bab898913d182720cf2136062809ca16d1d975a30b0ad9fef589d1a05c6
font_02_sfnt_off00019a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A8B 22428 bytes
SHA-256: d7a1dc3b2b69180dde82cc89e624707531fe6cfac3a5bbdf9da6401851ba8282

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