Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ec8a123a10d24d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-25 11:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e387d43a353f742ec9e87a54f1624691 SHA-1: d82cd07e7610cd7b1699accbad07b7362ecfb0d7 SHA-256: b3ec8a123a10d24d97fcc20738546b310d8d554c7171794793a2192e572c7c98
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 websites or are part of link farms designed to redirect users. Heuristics indicate it's a link farm on disposable hosting and a potential phishing trojan. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://maggievanostrand.com/uploads/media/file/dikejemedimeduviw.pdf In PDF document text
    • http://adas-muko.pl/photo/file/55604363329.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/95237934871.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/22781885585.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de2bcfb67---kogevevova.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1241235bd137dde8c9d284301d3076d0/vuwasoduxakizoder.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/koratavudokuguresekovakad.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b8096ecba5379093bc324eb38d382b99/soribojedimuvodofedoxij.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/kisor.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/zizawagene.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/dujobajezidixuxi.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/wotawadudel.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/36253748425.pdfIn PDF document text
    • http://chayka-svg.ru/files/424195078.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/bawitafaxemoz.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/10465939468.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bf076da2---46274293502.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xuramorabezumunot.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5a4f23864---24522718948.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/defal.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/4362458464.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161432c00af7f7---kezexurajerapazubudarur.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pnfiehq1a3pof0m02a9k9u7t8n/xewivisitav.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/11550628251.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/81100962563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adb+connect+to+wifiPDF 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_off0000c87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 19712 bytes
SHA-256: 9594f1418b9b94c795752bd137a872043f173b902b7f852fb1c7ab2cfe5f2069
font_01_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 10200 bytes
SHA-256: 9b057ed6b65dc9169e6769bdee6a44de8c8d74deb420f9f77f4b872e0c150ba1

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