Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbcf223a83424cf…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 03:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b114637ae7846d57ed79823bf576634d SHA-1: cf757eccab00084143f2db7fdade3c467b05eecc SHA-256: abbcf223a83424cfdc92149df64e14e47d9e36a40aa5e8a384b4e1b33b82be6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially malicious sites for phishing or further exploitation.

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://coretry.ru/uplcv?utm_term=uno+android+game PDF link annotation
    • http://inteko-tula.ru/f/file/jufudubitawel.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e57487f84a---27803811792.pdfIn PDF document text
    • http://kunbot.com/upload/files/55689872300.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/33804898358.pdfIn PDF document text
    • https://windsbs.biz/files/file/49509816392.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/46930639679.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/42045722728.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/jipawajonibabekiv.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/23548168571.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/11544646908.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/70036256567.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/torasiraru.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210920_131833.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413b91d3990---70711528416.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/95617197539.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/kajinuxi.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/gigefepavisufunetodofaj.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/binitujoperotiwiweni.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/46220820480.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/gexuladizixabavoxo.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/zexiraxoz.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/tumokazexipiwazabefejex.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/fuvubevapir.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jdeds8lve38u1qiojgtt23th71/kadovumovosezimaj.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_off0000b2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BB 10288 bytes
SHA-256: d24507e03566f220b12cfe806854b22355bfb8bad10bafda24d4c269a4f9b1d0
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AA 16212 bytes
SHA-256: 154a725dd976e751b8dc5cd11d29f724e9f4c7cfa2165f6d51d0c777dcae2fb6