Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c16a2301539432a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 19:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1b2ec6f8f81f151c1b30d45075fd10f SHA-1: a6e8d2fe58153bd42e1ab6dd8891aaadb75ef1db SHA-256: 6c16a2301539432a163ce44e400fe593f6cd9ca0c378bbd2ea83e04ae0ce1908
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to potentially compromised websites. Heuristics indicate that some links are hosted on compromised CMS upload storage and use disposable hosting, suggesting an attempt to obscure the true destination or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17140524231.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790b6b24f52---59909937822.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/55014320175.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/dulesakizojamov.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/6399253220.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0386f9369a4487c26c6fa7dffbba5e1c/miranabifakodabofox.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tavabiramoredarokaju.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/tometopedadiruw.pdfIn PDF document text
    • http://bronia.org/userfiles/file/56524303272.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/323f6f3c9f24b1640640cceb6a08ab74/16845274872.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/lavopaxutuwugolilujelo.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/futerutizus.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/3425224291.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/dalofopaduwugelijege.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/40873367801.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/27737076859.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9f3f7e4a09cd0ab58415d7277b5d4d6c/25012723760.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7903475098---gubiluvuregubezogutidoxa.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/88658832426.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/zebomo.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/21918831613.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/54931931845.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vibedesagafu.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5960c059b---xaruzinal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=electrolyte+and+nonelectrolyte+solution+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_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 18352 bytes
SHA-256: ec8322c662a3fbe84bfd0763e51f2c8c776e40eff2e514900ab84c835b66a606
font_01_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 10812 bytes
SHA-256: 5af997daa81122dbb60609c9d7c6b2b4098bbbc1dc55db13e497e6954d152fad
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1