Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecefad79edbd9e12…

MALICIOUS

PDF

71.1 KB Created: 2021-09-18 20:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 139d5d1130a341972fa78f2b4ee5b535 SHA-1: 8a4d1ec1c4c18ff5c01ea7caf4cf9a38e7b7f8d5 SHA-256: ecefad79edbd9e121177d0fbdb9d76871850322bb9a3ee9a3fb21a95186c667e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nabisori.com/userfiles/file/wetebogarozidovefubu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/92b27692b6b3733ed8d9103c8599b3ae/66472775863.pdf
    • http://sportingclubalbinia.eu/userfiles/files/20168382947.pdf
    • http://sity-luxe.ru/userfiles/file/72197833693.pdf
    • https://omprintandpack.com/userfiles/file/kesobarew.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2154d8b444a8d9eba0c979ca31138e60/79127205989.pdf
    • http://nguyenthaotech.com/upload/files/netofesuna.pdf
    • http://danieldesignpro.com/userfiles/ratitutazagufetetasu.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d71c9a0b4---nejovefot.pdf
    • http://lltsg.com/uploadfile/file///2021091303165785.pdf
    • https://ibshospitals.com/userfiles/file/22558512258.pdf
    • http://alpha-cp.com/userfiles/file/kigovezuzosij.pdf
    • https://mfdesign.hu/files/file/dogiwegeguposubogidoku.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/96093355473.pdf
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/33317811662.pdf
    • http://leguido.net/files/36778949586.pdf
    • http://santeh.md/img/files/11666239621.pdf
    • http://htwy.com/upload/file/koxodexudinitimiv.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4f843cd2cccdaad412e7b595334ca105/nugupuluvow.pdf
    • http://dedanskecasinoer.dk/userfiles/file/812065571.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/radutufazoxegefanixafuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cleo+gta+sa+android+no+root
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b48d.bin
325ada17aa2ce45de743ecad2e84a7619f1933e1842fe5d872898f88f4935de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 16560 bytes
font_01_sfnt_off0000df40.bin
444b7682038940c63923e18b1a4ffcf5f0a6969ad47f71fce0636b09f55c48a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 10456 bytes
font_02_sfnt_off0000f6f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes

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