Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b85d054d5adb46…

MALICIOUS

PDF

62.5 KB Created: 2021-06-01 04:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ecda0f17ba04f4b993df39683dfbf72 SHA-1: 5744c83860df93ef0c388be96ecefb9ab1f8c24c SHA-256: b7b85d054d5adb462acc67cb02ef7b92cba1f29e66caa7039b9f9969454b074e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. ClamAV identified this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple distinct hosts and a link farm pattern indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1cpogks4av299ful3h38ct1d61/godatujirizelujazisiduj.pdf
    • https://aimara-bg.com/userfiles/file/dobegowotarifokixet.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079369dadd74---43851323517.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/697554cebffea3e14d2f28f953aa4398/68883076364.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/8406c906520040eb5dfe9490c564b2c9/rawuwumugalaxaletusubunu.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/nafezesoxolenawetirivuf.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5fd40aa98127a6e982fb43756d4c8055/95342544994.pdf
    • https://damiel.eu/userfiles/file/lafivokevasafanufowokowi.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/mdvbklrraktpbf15h7p54lr4a5/guxikilukejavunif.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160731f3b1ebdb---69862163760.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/66ct96q7kkic8cg0ra1gnufdqt/jekifabufovopo.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8ed0454d45383dbfa46eaf0171ac32b2/satunigapuwima.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160798a6c58abe---bipese.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f2938b312c893af58ae8247069fc8756/72433117788.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/23056590281.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fisica+2+bachillerato
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd67.bin
255f0cf7139b71ce7c48fedc1de1e3b230988c1feefa80d1a1d56f6772ab4381		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 5116 bytes

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