Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06a3ea2a1d55979…

MALICIOUS

PDF

63.9 KB Created: 2021-05-26 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f013c1cd0266e5e40a6785a00c9b715 SHA-1: d0767b5cc075fffe55185182d188b93f4687c5c1 SHA-256: d06a3ea2a1d55979382ae414b7ca83a6ccc0d5f3e077b8974145864c0618fb8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. Although no scripts were directly extracted, the structure suggests it's designed to exploit PDF vulnerabilities or trick users into downloading further payloads via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8592

Heuristics 5

  • 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
  • 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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0d1e63a0---22952466200.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc012680f---13456883815.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/874238e3e3aa3005428a9aadd5956387/lumebadamovusidim.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vs5s79i0d4prhp34ugs1lqb3io/92499654198.pdf
    • https://andrejc.si/files/file/gidivumab.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/285e2a72cedc06c08507cde002aad683/49281936042.pdf
    • https://bawwabatrizq.com/userfiles/file/surisofopofozomolujit.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/57h1hkdkklmitqt5bbdjgnh2e5/renavilulatofenuxewifib.pdf
    • https://diaochue.vn/userfiles/file/51391232887.pdf
    • http://agcslohian.com/userfiles/file/daxafapovidekamoxu.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088651b4580f---konij.pdf
    • https://chp-travel.ir/data/file/dapikusukomuta.pdf
    • https://a2designbg.com/userfiles/file/tuvebaw.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/566e019e7abba9e86c3d019a00dacfff/54803320715.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/161ad5a8f51d39b8ed7c0f5eb60bc01c/40349250367.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6c63767d1---kawekovolali.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=rashays+membership+renewal
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf1d.bin
a1d7bfd7188dc000d00b9e6e96d2f00f3207ddde799ef92ee25a6e4215c4b91e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 5000 bytes
font_01_sfnt_off0000dfee.bin
62a0784a2d31d3cd9d28d3c0c18626966d6882529def398bd5816095a671e146		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10088 bytes

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