Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c15cf4c8236e11a…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 01:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60427415380ddf0be5300799cc744561 SHA-1: 597909b377d6679379ba4612d5360d6758360afa SHA-256: 4c15cf4c8236e11a0de1083048277a7e26d35f56646de60fb84de8a5e397b5e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The presence of embedded URLs and the heuristic firings indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3b464192ee5d13ab6343a5fe42f5fb8b/fizitelimilan.pdf In PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be1b39c38cd---27267804246.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xuvozija.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xusoxubesawerug.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6cf7705df---19619551812.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d659509e9ccbc5e906d4a00ae4215224/labegesoxemigelakudawud.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee091033c3---24702920546.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7f3a8e78---80576981405.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sn2inqkpd65d0vmq5q95g9i2kh/xesaj.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vibokugizipozatuvofejawo.pdfIn PDF document text
    • http://fitviewer.de/files/file/58006953634.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/22787564118.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b97c91b7---93349381181.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/353ca50c474dc4a1a18bbe2509e1d477/fabolep.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sd0fuq8eiqm3nrutm1pp47t2tv/xidonekutosozabiluzibizil.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/84841251463.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9233d15cc8---wawisetusitelomevatuzuris.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/d2d86c34f41c8c68b375cb78c6f678cd/mojot.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/bazasitagenuvomajat.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/witefobepolimokezopil.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/38d59917e935beb71ed71e0bfbea6870/6261687992.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99311a4290---15750194656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=direct+and+indirect+speech+present+tensePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 17412 bytes
SHA-256: 373cc4e4a7cfc1604ec8baef829036b5752ec35396615a65d96f43b7117f847c
font_01_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 10448 bytes
SHA-256: a871d2adea84cf3022085ba8a4e3b7ddf017e0179a7c9b7c320594b20f16e4d9
font_02_sfnt_off000131c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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