Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1388abf43b1824…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 15:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cab98c6ccb5c3f07698fc627820ea43 SHA-1: 4df9c2fa483cfc49a2a69777f501aa9f1eb6460a SHA-256: 3f1388abf43b1824a39e965673639f23eb1cde6ea4f4591f09b379935ab57ffc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=cricket+lg+user+manual
    • http://sovaimm.it/userfiles/files/takepodafinukokikiwoxebuv.pdf
    • http://fine-cottage.ru/userfiles/file/5923418277.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be6f04746---60291594410.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/57bf77b39812cf4d1a42fefafc00873d/40910157249.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3d4db12e---42207321004.pdf
    • http://teamtrinity.net/trinitya/file/lekazebiduwa.pdf
    • https://okazdedziecko.pl/_files/Media/file/xumetuxij.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/smd9unc6vaedosnjqv9ek8ap44/sapadavevuseto.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/27743226164.pdf
    • http://soojuspilt.ee/files/file/fulixisupejaguvanuneno.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160711ae9163f4---lalogowufofesonifad.pdf
    • http://vip-cond.ru/userfiles/file/povowodenam.pdf
    • http://pass38.com/images/contentimages/files/9582340751.pdf
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/31826651344.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c241e7b33cf---67391927431.pdf
    • https://tavcam.com/upload/ckfinder/files/94356865676.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d928ac2cdb---sobepu.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/laxas.pdf
    • http://kaushalacademy.org/ckfinder/userfiles/files/gupebilorabipelir.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/03b9161c563d6b3034536ee46be770d3/xapasidi.pdf
    • http://mamtomchabahai.com/uploads/files/files/43269721867.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_off0000dcdb.bin
9f984198b6665f51cfa1a5c423d332d4e8b911962a393f9aa13c474198f8b628
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 17040 bytes
font_01_sfnt_off00010913.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16792 bytes
font_02_sfnt_off0001212a.bin
87c59b8d63361e417abeb74b3e3f0f1b6aee75ed882f85b354aec5dadf3417bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10676 bytes