Malicious PDF — malware analysis report

Static analysis result for SHA-256 43014e613d01a621…

MALICIOUS

PDF

94.0 KB Created: 2021-07-09 15:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99ed5b658960dc2b571aa5b8924ef0be SHA-1: 55ff9dbdae64fd3a89fedb27aa83425cf644a3bd SHA-256: 43014e613d01a621e5c420b9450e2fa284762ecceb9b66cc214d57245295e33b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised CMS uploads, pointing to multiple unknown URLs. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd5f7574f3---16266835202.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2bea43a2---51610288109.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/0f7485e2a250a4a1e4a2132fb29cc9e1/82357932155.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/12021134486.pdf
    • http://prvugkh.ru/uploads/files/10038103556.pdf
    • http://hnc2.com/userfiles/file/zisugarokepameke.pdf
    • https://betalinktech.com/blmedia/file/gagoriwifafijabupixoso.pdf
    • http://cbcom.eu/ressource/site-image/files/wajetovasumabaraxo.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/c3kf7a0dg8u27pqdf0b3aa4drd/54009251186.pdf
    • http://sarlampa.ru/upload_picture/jusuxowujesekewavapubirin.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5545c8da3abfb6c8bd9b55c354b56f48/17167871740.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/abbn9d41ssgj7h005qqgopjvin/wedole.pdf
    • https://anthonygillant.com/userfiles/file/58927786902.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e6ecf32b5e61d539c093fd78f816fd55/filaladafule.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086244c774ca---39598332235.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0mqumg5hb3d8ik9tc4mi43v0ga/60756718174.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d102cb74d7bd79c67a823fa5a723515e/romivo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c226b606bc9---melikegabuwafirov.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dde7d9e8ed3b5fd35768c13f45ab904c/vunamezokanovisof.pdf
    • https://activepymes.com/pub/file/84392635878.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7cd4e86fa---68541356093.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/47bfde18090b3e99a3a176b961b3a32d/80741624281.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=acute+triangle+meaning
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04e.bin
ad35c70ac5b1f693266ba897be143362ca4ada732c87dffe56d142d07f521850
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10368 bytes
font_01_sfnt_off000107b1.bin
531e95eeb099c5cb44a3d564c594c86fb99dd5b40e6ccf8b6251e4de7823f19c
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 16600 bytes
font_02_sfnt_off00011ebd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 16792 bytes
font_03_sfnt_off000136cf.bin
402a0fe1a8dcd2f469c2f64b2ed045fd76c0162e8e3a5395a57df63d0cbcf258
pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 19372 bytes