Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce83c8c1a7ebe4f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-10 10:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: adf34866f1df211b38e04db4bd81680c SHA-1: 162f0b42ff27d057d41d14160d700a26384d3127 SHA-256: 1ce83c8c1a7ebe4fc19df1ccfb9877dd945a54f918ed829774a85e8c1554fd4c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/83feea9a996a0f9436289395fb63c6c2/momadawuguwiso.pdf In PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/megeserasutidilag.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/danedobu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jebixaf.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/kixarerasef.pdfIn PDF document text
    • http://wohntraumgmbh.at/99707158555.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea05d53e2---wibilade.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/35590070847.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/95551302377.pdfIn PDF document text
    • http://symbolfoods.com/files/file///senopiwarixeruwu.pdfIn PDF document text
    • http://chinalabware.net/d/files/57016857556.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/wuzemuruvijevajoj.pdfIn PDF document text
    • https://togeltop.net/contents/files/busajezozikusexekoj.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/31089877855.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130405e5a197---kamatufajawufugubik.pdfIn PDF document text
    • https://linardi.ru/files/file/zipoxobubefaguz.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/kederorerapixumolibave.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/tejijowikoje.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kakupibaboselo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03b7b688c---juzixaxelagilumel.pdfIn PDF document text
    • http://hexindechem.com/upload/files/62142390534.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dafuwad.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/9447598385.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/29428199405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=skinny+love+sheet+musicPDF 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_off0000d5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E2 17560 bytes
SHA-256: a1f1e9a1235770e277e2d9ad4e6ea35d2485351b4ddcdc9744f9a154520455e4
font_01_sfnt_off000102f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 10680 bytes
SHA-256: 50537c8da099c4ec83ca02ad13cecc4dfe6e5922331599935add10e4f77fb633

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