Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f2aafb51b5db86…

MALICIOUS

PDF

85.8 KB Created: 2021-06-09 21:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6598d794d8f4872150a16385431190 SHA-1: ecf2b3ac46ab2ce919ca2af3ddb53e91de703afb SHA-256: f1f2aafb51b5db866872911ed8cb3b0c2b0d58952226a49f5796c0584208bf2c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. It presents a fake CAPTCHA or human verification prompt to trick users into downloading further malicious content, as indicated by the 'SE_FAKE_CAPTCHA' and 'SE_PASSWORD_ARCHIVE_LURE' heuristics. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=pubg+mobile+aimbot+hack+file+download', suggest a lure related to game cheats or hacks to entice downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=pubg+mobile+aimbot+hack+file+download
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160988c225b94e---35743032877.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913dd651a26---8908110602.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8682a6871---71445351854.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/dirurunofewolijoludo.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/34b4ab6717cb053ec0ebdad04b29d096/pagozikitibed.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/40720bc21f69ff9779993351c7e97699/93781452269.pdf
    • http://botosani.ro/img/uploads/file/10749948462.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8dffa0f1c---sepogugab.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0kiiap3jaaf3lu2gc0d5l5pi6f/fifisobekop.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e06448e22db9e87fe25415db77368d68/92269357712.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ddf4b5f5d---nefozijadapetijudu.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/47cb21a66b0d7aa778278c88c5c0e185/70160397966.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4c45f16fbcdcc3fc8a377b15261fbf2d/88365646074.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/52094870352.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3e6dbc26ac1ffb927d8f96ae9d8e610a/pifinotepijulososutuga.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24614cad2f---kutotigorenanujaf.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55aa90f68---50998089823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011166.bin
bce82dd1f0527e583771066b92969fbda648b051e2ce8a73b7a9a486b74ebc33
pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 5456 bytes
font_01_sfnt_off000123e7.bin
6caa2dbd0efa0a05e73121f1934c42aa3b47fbcba5f3f43d0d9ef461fe93a495
pdf-font-stream PDF embedded font (sfnt) at offset 0x123E7 11220 bytes