Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31a368569d264de…

MALICIOUS

PDF

87.6 KB Created: 2021-07-12 17:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1066285456f5e74a29e5054395e7a80d SHA-1: e56dc2c9d83430c5b69d0bca7a3f109256058940 SHA-256: f31a368569d264ded76f8b09f52074f2a9de705c917bb94c0cdf4b15a9dbef31
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://webinaris.net/ckfinder/userfiles/publics/files/pixoxabujozudewof.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b13155c1b33---56784500237.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/2bi00fkkfu2pisthm3gqim56b4/dabazatisukirixokul.pdf
    • http://kleiberit.ru/files/file/kotixunif.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7e61f703946086edfc08487641f8cde/63022164643.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d1464a04b533e75901fec2da514f330a/15409225830.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/vfm3r1pmae4i02nssf66j3ter0/33806569085.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775ba76bf6c---puruvipulexobosamejaxediz.pdf
    • https://soudurelauziere.com/upload/editor/file/488021905.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6283b2b0a---78081653955.pdf
    • http://rialta.ie/userfiles/files/88393672592.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d256836662---83228874813.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a0966d42e36---woxepopununuragoxixiwu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a581ed9a---88114322690.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c17454d59---pizadajamuxosijedosuzaza.pdf
    • https://ngonluathan.vn/images/ckeditor/files/zotajagid.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/a54f4a52070b658720f1b50988334ffa/fubitof.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/860b38fda157fcd7adb0d94a284da082/guzewurededirumewa.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/4ns9t623tkkl3te1jfest9k4l0/tilotezulisukol.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/74314517049.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bbe4a2fdfec2b6db75eb053798f05013/99126867910.pdf
    • http://www.findvoters.com/userfiles/file/318420386.pdf
    • http://abbwingslynnhaven.com/uploads/files/xegiwadiveke.pdf
    • http://kinocosmik.ru/sadm_files/zotosulotuxerofoxozu.pdf
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/baxuxavakezavomisu.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed92e96e2bfb98a6dcf5d232805aa130/favinujugam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=frostbite+first+aid
    • 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_off0000f4cb.bin
fdb3a27837649a44ab0e40716e593303a8b91ae297bb193211e6582881b2e8df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 17172 bytes
font_01_sfnt_off000121bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121BF 16792 bytes
font_02_sfnt_off000139d6.bin
ea17af090c8f98fda36ce411ff972bb3ba4fdcb3db7e3a42b33023e682a5e1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 10312 bytes

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