Malicious PDF — malware analysis report

Static analysis result for SHA-256 60998eddf711b144…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 20:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f652ac94e1b6e4579de9f6bd63f27be6 SHA-1: 54a4181064ba50bc516828225f64d2dc1a832462 SHA-256: 60998eddf711b14423ad1a44d01fb3ea4d09917de4df28c19eae16ff63f2e6c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/luvaze.pdf In PDF document text
    • http://poliinc.com/upload/files/91671177295.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/89039809370.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/jepotolozifo.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatuxetiga.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202196212521238.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/5400223222.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/ravenuxumure.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73246645405.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210914file///31858264292.pdfIn PDF document text
    • http://manu-transport.com/documents/file/rorenojawanipapewusazizu.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/79815810076.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/17941828417.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/datorunapajekaluvubusi.pdfIn PDF document text
    • http://npas.ru/pic/file/28353785443.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/47751032123.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/65926586894.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/23272674861.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/c74f416a86dcb3e070f968f72381c9b1/72929052925.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10eb717c0---48426193888.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6cf927e326f2f53591d31e276a18d2ea/71651977696.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/karekuwofesik.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/80081900749.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/28050489829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mugen+train+tickets+usaPDF 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 10424 bytes
SHA-256: b5e30911de835b72ed10ef5811dde0b1abbd18c836cd5f6d9831e532d2742755
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 17600 bytes
SHA-256: c0401079af4cfa74a7e0a0ebb2e747011980143950398f474387679562db6c06

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