Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cddaa2fe42835e4…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 12:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76de602350d412ba3fd78b12088f75fc SHA-1: 67c65584fcff7b885a5ccfe3213c8760da7b52da SHA-256: 8cddaa2fe42835e4aa3bbb9f693f6900ac1f0700e0f8355a8a8c636c60c0d12d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary function appears to be directing users to potentially malicious external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://uetty.xyz/js/ckfinder/userfiles/files/95985446779.pdf In PDF document text
    • http://slsnn.ru/content/file/xiregujagefozipawezuvof.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/60319060517.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161216c899fe5a---97432089296.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f27d3a0cf58---93008642140.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b144fb0e---21258450760.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/pinusodelajenolem.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/metujeketokubezubowili.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/85713973006.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f2f8a8275---66158925370.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/govaterisajukegobet.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/petososibabofitekuz.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160defd1de511d---98623688496.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb5bad125b---jukifibugofonenigite.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb08d197e---7813216130.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/woluxareze.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/60723381236.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd9b07540---13359395249.pdfIn PDF document text
    • http://fitviewer.de/files/file/28357819792.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/pidolodokasolukarinu.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/setupojutaxotowo.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/50735728.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/70651697291.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091687c2308a---nefefuretoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=reasons+for+change+in+demandPDF 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_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 18052 bytes
SHA-256: 5809de4cf99ccbb522dc1a36ba1bf3dadba42ed465d242d34e7e5a5f19af6c0c
font_01_sfnt_off000125ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AE 10824 bytes
SHA-256: ea11e4af75cebcbe9445cf2f588a79eeaaecb62cb7ff6992e76b5de8271a41a9
font_02_sfnt_off00013e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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