Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b9e5b39b4fdba9…

MALICIOUS

PDF

77.7 KB Created: 2021-06-09 17:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83171450d535e6ecc04027a9e795b2a2 SHA-1: 555243787b79729a8e32adfe8fd2b2df97c51972 SHA-256: 12b9e5b39b4fdba9444bf5b829de9ffbcbbd42735d2c9b813a743343b6870c14
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 redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8501

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://crysiq.ru/uplcv?utm_term=jio+rockers+2018+telugu+full+movies
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec80a8d051---95313758953.pdf
    • http://bpsstudio.hu/uploads/11114847899.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083c2bc61ee9---pavibutimukaliwugiv.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/983f3fbd6317b81a23a11e24e7c24e68/ruvovuwitatumonewevoje.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a18397daa---kodizotasewusirezikum.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/jh3p0omg9h7fbhak8fppn1fb6m/xikipedozikegugir.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/35151076223.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3fa06cbec---mekinotidajaxogikudaluwer.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac140c33e3---duginadogorox.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/83625862759.pdf
    • http://mya1fc.com/files/ckuploads/files/zuwerano.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f3b31e3ad---tejedabimek.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e81102cb8e2f71d0ded45b312bedd3cb/4429833545.pdf
    • http://learningkey.org/userfiles/lezawiwex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023f.bin
eb3e144d29d0a9df4b0f47edf0cf4c0e5962410937a677b5c6a51969ac498ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 5624 bytes
font_01_sfnt_off0001156e.bin
2a7223cf2c059ae90a80675c43892285a0ab8330194e4aa875177219a58ee3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 10724 bytes

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