Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9302cbb4d21d67a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 00:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03ef1c4e2021258b683f1821e0292a48 SHA-1: 3b5f639e359e9a08f15409cd6d7ca9690d77917b SHA-256: c9302cbb4d21d67a6e952781d4283e33a6d18fc3811602ef3f1f85e5bb6f8f01
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links are likely intended to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e91f507c0---sapomobigekalaremuta.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/486dfb25f348036ab8dc9f9d67cd6efe/50567445863.pdf
    • https://gazelletr.com/userfiles/files/31318424835.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160743c29171a8---54683110279.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a8147ab95c8---79925630821.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078996037729---xivezuwidadazuxu.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/38339167052.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1568d6bf340912bcd062e9c69e216bdf/5135603371.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/4u9nt6sbsds04h5d4odgtgusir0duuef/wodosoxutelesagi.pdf
    • http://emilygrilltogo.com/uploads/files/xefawazeliporugezonuvu.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fb1ljnvg3b9fjii3jif2t1dhjc/keporuzonavifojudul.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160beed665f8e2---fugukubemisukurake.pdf
    • http://esipro.fr/userfiles/file/71712214129.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3eb98c87---69131440133.pdf
    • https://langestrand.se/anvandarbilder/204/files/poburofumax.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/48e9365a6526bd38eae855c46ea636f3/mavabadafijut.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ad851e89---wamugikurufabidu.pdf
    • http://www.aqsclimited.com/EditorImages/file/59343010318.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc41e6b844---zegonegukatitebuneniro.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/57650646895.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82748b0edd---77364311690.pdf
    • http://hotstamping.pl/files/file/84674251242.pdf
    • http://taitung-house.com/CKEdit/upload/files/bitubaxuferukagazek.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05162e3c8---19046308208.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/98930518731.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=polar+covalent+and+nonpolar+covalent
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1d014eda93611042e7e83e2d417eb4dd/77108007758.pdf
    • 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_off0000eec8.bin
884915c8674102f8afdac636c8075398660652733f37fb646d3473a490c88d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 10316 bytes
font_01_sfnt_off00010634.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 16792 bytes
font_02_sfnt_off00011e46.bin
d1abaf00b3d8394e1a80b856280d1460fd2474e40266a343c406ecb181329792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 17908 bytes

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