Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9a24242fe5425f…

MALICIOUS

PDF

86.3 KB Created: 2021-07-24 19:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5236272b54892b0ad19e631f83762d70 SHA-1: cf908c94ecc252396ad2da23582ebc3d9e29d07d SHA-256: 2b9a24242fe5425f9e8c695165e90513f0a88a0b7242941455b7fb41d56be102
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://betalinktech.com/blmedia/file/85681512222.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c929007fddb---34561707009.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb874d49f2---41483643433.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/97316361997.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/wapupomekerivopisemej.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/lugerukujameloda.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f862a77af5---13117918610.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2dg4uefqv0qhjn54u3rclf35b2/digesinepetoga.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/grthohdte8chi12s0omb6foke2/vavovasoxaxupunapi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tuwiwilepo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7bff8e301e67bfae0a04c94684f6e6fb/18140003641.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/22469197299.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084aef84431c---11412048029.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b50d4119---16986442011.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/92980038043.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfe46272a---xenumenene.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c932631c---zamusuxog.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/72886515963.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7af434d4e---73811483938.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/tamizuzexuzolumesipiw.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c66f0598154249dbaaf5d8917ba3e2b1/18938967070.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/8121100829.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2641c48bc3bde973ec8b04112123892c/labofokowegiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=advanced+accounting+2+guerrero+solution+manualPDF 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_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 17112 bytes
SHA-256: 56ac577041a7dce2f2d37b8952492a38f23a04508d6c19c7f23237bf43faf5c7
font_01_sfnt_off00011999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 10980 bytes
SHA-256: 6c902e3fce6dcbf457bdd7fde17bbc75beff7a05d16d8f025dbc4d4a244f4074