Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6106e5280abc21b…

MALICIOUS

PDF

59.9 KB Created: 2021-05-10 15:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a806afab250257635619195a37aaeb72 SHA-1: ecbcda853e071bd796b3d4ace61996ec7e97a377 SHA-256: b6106e5280abc21bb002ec5339846e77f046750b8f21c11bee92651b58b31ddb
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, hosting other PDFs. This structure is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

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
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lenel+onguard+7.+4+datasheet
    • http://scripts.sil.org/OFL

Extracted artifacts 1

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

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