Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d12f02c56ed4f1…

MALICIOUS

PDF

64.0 KB Created: 2021-04-28 09:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932524a57cb05ee721b8400e3328ddf0 SHA-1: 3dbd49daaeea2dc0a4297a5d69befeadb5ff856a SHA-256: 56d12f02c56ed4f1a0519ed731abcdbda5f463054610787eb3af010ac8921a42
154 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

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://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/52a8a1885603c21ab667411c2a82a35c/jesubozudipudegog.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16cb58a9b---wevusesozekejew.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070157af2155---9921512456.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cef2527d73726d027443ee3a76b7aaaf/49803090517.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89619f381---67358181161.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0fc5faf8b660a5489d8178a6b9d67bfe/71973019764.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7faa7c370---ruzikitomubukagezodotu.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160701bc81d120---rolupumomegadujasinekuj.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070869f6660a---15995956166.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b0c42ee1558ef99e6807c8211d96264f/46824889961.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/b7ab65mih8bsuautou3nh0s72d/pomawexaferofefonopa.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608259a86a203---tunukekefebalusib.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ad920c68---jisivasilakafasaju.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813296a8529---fezuforuvedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=culture+d%2527+amandier+au+maroc+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de5d.bin
bc50f648db968543e80eea18855cdf1d8789e39fbbf6658998ae4cca1bbae547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 5064 bytes

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