Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a426a94ba6bef83…

MALICIOUS

PDF

82.1 KB Created: 2021-09-23 16:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec93937aa457a9f894ad242b3c98cd42 SHA-1: 7552a1e74b235488a35caf0c776365aec8f05735 SHA-256: 6a426a94ba6bef832ae9296d88c289eec7d360dd40f1ad58232df601d4755ee1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://floridainvestment.cz/files/file/39520502981.pdf In PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/98149156757.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/65712083229.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/78929278528.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/kurosatatekemede.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/gugamolifofotexazositu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba6bd16c5---zarowiliwarenegamozavaxu.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/2295469585.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/59794697752.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/lezukodezabilulurepajet.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/87745834864.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/wolisukosedojivas.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/8662636982.pdfIn PDF document text
    • http://lblussana.it/images/file/kidirutuxaxasawizijo.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/56674289837.pdfIn PDF document text
    • http://lepixz.com/userfiles/file/xigukaduzi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd8ea50d3---majutexusowibapamezixol.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/14049662852.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1622737011613060cd4cf07.pdfIn PDF document text
    • https://eniedu.com/data/file/20210921061226.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9010dcfde68643a638d1deb9e9e4a40e/52171690726.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/38019338351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+transfer+photos+from+android+phone+to+sd+cardPDF 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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 17580 bytes
SHA-256: 56f352426780d2a6c1b3aab5b413476ce2e0d080e905223942cc24ee2a75e80c
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 10916 bytes
SHA-256: 4af87ce0001dcc5ca344f6d257fbe4981862e894cd829348689cebcd66d93e56

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