Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca370620f1b2ca8e…

MALICIOUS

PDF

79.9 KB Created: 2021-08-26 14:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5937ffe8279088d25418785446da108 SHA-1: c24b4cd2fb702f0f16c98f1c63d2241879e14361 SHA-256: ca370620f1b2ca8e9dc2ff5d18ec9ca4a1de607c273469a9b9156cee617d6951
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting a tactic to obscure the true destination or leverage potentially untrusted hosting for malicious redirects. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content, likely phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57946041145.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe6d503b11---tinajirafejezuvov.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/38209774379.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210820_210543_5124.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/vawikadojatalanuzodepe.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/dutelopixugal.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/nutipedetuvosakijebo.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/68752830513.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdn5tr4sumjl3m9c7rbnvomu93/66835092710.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/orijo7ijh8p6bt0m7dba3ma89q/nakofewuzininodenoni.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b670a5afc---difafitaxuverufororur.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160adf124befe5---47501549860.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/15071471093.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/29635972685.pdfIn PDF document text
    • https://epiphanych.com/images/file/59338981925.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/safuluwenetexu.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/71890264967.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/713dd3ee31dc1f3f5f6d4da3c08edf57/90286591581.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/86660837679.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7e16824da1b4639f0489b92627cd409d/57806678498.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/tetemixikavifufiximedes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+merge+different+files+into+one+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16408 bytes
SHA-256: f5dbb052f1feef0090acd539c7e79b07734edcb372b117dd8cac9468a290f19a
font_01_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001191e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 10756 bytes
SHA-256: f3cce071423979fe0d1274e59886a7af9cfc3128cf87ddf967d8261813c76de8

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