Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5b2dc1afdb02f7…

MALICIOUS

PDF

72.2 KB Created: 2021-05-10 15:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eaab524aa796c5338de8bfaac4fb86c SHA-1: b32f22bd2c9f413d3f4dfb9dbacecf7d1ad30e54 SHA-256: dc5b2dc1afdb02f79766799668bfcb294b2d97474a3b9c023e30060e51d86f8a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to reference a datasheet, likely a lure to encourage users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7622

Heuristics 5

  • 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
  • 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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1928540f98e59754b884740e6514fb8c/88283588042.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1ad7118---jojugokosopadif.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094336cc78b2---verisoweposumexiw.pdf
    • http://poorclarescork.ie/images/toninozusalatuperibiwujux.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d57c6b87---75602558810.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609674a412e9e---genor.pdf
    • http://acpiindia.com/userfiles/file/25424672104.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16070286ae124d---15329378045.pdf
    • https://aartipalette.com/userfiles/file/65908460581.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4f6b5702ed92f3958ffab85e60d85351/venetawuver.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f60a43578---78402271215.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/c1a7b4507bd7691ba340b4ed3940a5ab/gudejezajer.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fbad3fd0---revopedupifegog.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b8ea140354d5c3025266f8521e480733/xifadegu.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef03388a8---jonosafagizufawof.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/636aeb1fc99fa588eee3db68c48e1c53/zoboredujijopiminotojuto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lenel+onguard+7.+4+datasheet
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de07.bin
0dd229e31b1eee136420a6e256fd45d5a197a4438d8c113874570559dc8dba96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5064 bytes
font_01_sfnt_off0000ef4b.bin
ea0fe174b76e649eb329c035aea8ae1b4ac7ab7eaa64000b5918b4539e0f61fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10796 bytes
font_02_sfnt_off00011430.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 4324 bytes

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