Malicious PDF — malware analysis report

Static analysis result for SHA-256 c439cbaf17d78e20…

MALICIOUS

PDF

79.5 KB Created: 2021-07-20 22:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f62f67c51a63892d935ae76d571227b4 SHA-1: c4a599ad995ec4fad194a1916a799e7fa487f9df SHA-256: c439cbaf17d78e200bfc05e24624cfc890ffcc9c470b25975809000bcd0d9235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves luring users to external sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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
  • 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://szsahsh.com/uploads/files/zigexejuzuv.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/uubihgqo820rjnnk0bklloom74/xamejuviniwo.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7e4cb0fc8dbd2501eec0a28d58996950/dazuwitesutim.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839aedfdbf---80510506955.pdf
    • http://gramercy-grand.ru/files/file/wasafo.pdf
    • http://amexeuro.com/an3_Uploads/file/samubipatafukavixe.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984dd6dc9fc---gebomewigotaw.pdf
    • http://apnorajasthan.net/userfiles/file/noxopeloguvikolitiso.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7edb450f45c5015328bd9770300ce910/xefamitojuv.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/34263024649.pdf
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/30536810320.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904c8612258---lawususid.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608800a2378c8---rifudevagixejizisawusi.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8d83a723---gomividitibapororunekim.pdf
    • http://meskerjager.nl/media/files/rutijonifufoge.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/88d03b8bb751eb0d581c273622494ca7/foxixojudiv.pdf
    • http://kpghomerepairs.com/uploads/image/files/5172380673.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/33140903830.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/15736257893.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f9d30cbf776b13d67990a657da07ec0d/zulesonijukaresawugami.pdf
    • http://ytbozhuo.com/upload/file/061753088908.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/8hm3g9p350j35lt7p0ktm0n400/74608174460.pdf
    • https://soudurelauziere.com/upload/editor/file/vatodobuzalepepasu.pdf
    • http://congtyvima.com/images/Download/15553779220.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+1+vlogger+go+viral
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DB 16792 bytes
font_01_sfnt_off0000edf2.bin
dbe7fa04150c2edd19a234b720208fe89a59852c779fa3b9fd307ae6984fdb43
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10256 bytes
font_02_sfnt_off000104ea.bin
ab8ccce300467df05cd2561be44c563b17204c593d009201af5eb5fd9fda4331
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16716 bytes