Malicious PDF — malware analysis report

Static analysis result for SHA-256 406e74146bf14ca4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 09:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4635b0c48506aabe38614d9c7c367772 SHA-1: d454b9e4c2a57a1249d290e33a7bf581910b9027 SHA-256: 406e74146bf14ca4540b18edc82b2c177469c49df0b2e26134c4b932de6d5a24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pixomot.ru/uplcv?utm_term=csc+form+212+revised+2017+pdf PDF link annotation
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16286209306419.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210814154102.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/tumatuvobenir.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/df7f9c9d13213e8fbf405c98025b2b4d/73983403231.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb2bc5eb70b45895100580fba98bbaee/logewesametojodevazixa.pdfIn PDF document text
    • http://hk-keber.de/images/file/ginekebivib.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5785a5625---jowevavufodemi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c006c2f3b---63753591765.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/24797168190.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ia4r5b47e5t4jhkc4mkteorjv3/19700664501.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607410d459312---54450601919.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b2fbef4bc.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9d2696c3f---vojazevezijunupiwag.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe133777---jimitiserowa.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/jivenukozefuxezul.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c532a060---32951851889.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/63392284215.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qvbnfauvnteit9vak8nnnr303o/guvonipadefuxemew.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/20495668289.pdfIn PDF document text
    • http://d4storonto.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jozezekisaz.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/16b43c073c590eb7cbfc9e18f3c28e67/sewukaseredin.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/11883633452.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/rafebamefamoxelaju.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/68267563422.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/98e7a04ea3ae5991788c94336ad8207d/61324239005.pdfIn PDF document text
    • https://ocw.tw/uploads/files/pewasunofolit.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 10812 bytes
SHA-256: d48a742c77d5ad7b0a426f27aa06609226072f29862607b2bf4113deb6ee718f
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 18132 bytes
SHA-256: fba5580ef1310fb33c795e726b46de07dd880d167852ade3e652dd110e30ccb2
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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