Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3f786cfeec6309…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 13:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ad0c6390bbbd883e0f3f2e0fb1f47e0 SHA-1: dee5e26eb954b06c41d6e483ba543e25cc7cccc0 SHA-256: 3c3f786cfeec6309bee3e019d13e011f6ce770d5d89bb02e9702e9f98998f9d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several pointing to compromised CMS uploads. The presence of embedded JavaScript, flagged by heuristics, suggests an attempt to execute malicious code or facilitate redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=bukowski+notes+of+a+dirty+old+man+pdf PDF link annotation
    • http://noithatdangcap.vn/app/webroot/uploads/files/nosonavotejavexes.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/33189964285.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/mopisurupusovipujed.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/54245630584.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/39354532731.pdfIn PDF document text
    • https://filetorme.com/upload/files/47235689379.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613486e6201a4---16065185479.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/70528429120.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/91648048516.pdfIn PDF document text
    • https://plasy.com/uploads/file/fabizulafoburepo.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/bizulitonaritulu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/50074038374.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/34815459377.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/74744933365.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613600c9eae7a---gazej.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/84323031096.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/losalaw.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/watex.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/90972567429.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/10294519132.pdfIn PDF document text
    • https://parfumzone.ro/files/file/11756393232.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/zimewex.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/99037732432.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/8659d6f4e5f999d583a610e1034e7c4d/sesajuwiwefumiximubutirun.pdfIn PDF document text
    • 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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 11104 bytes
SHA-256: 13e1f3d739f68e68cc168416dbe442e14454d4ece57a92463196a80ff01fe9c4
font_02_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 15408 bytes
SHA-256: 9c56eb9dd5c9315249052ad34ca2735019cf844110bf15a0af21ec2698919454

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