Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdff0f878bf9235…

MALICIOUS

PDF

75.4 KB Created: 2021-07-19 05:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0b2077d4af980384916aafdb9860c061 SHA-1: 72b84a44a2c9d02d97b1f842918fcd7b6afc4efa SHA-256: bcdff0f878bf9235aa442de83c739897d6224909dbff69dd57181e90a8f97ba8
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://metisentry.net/ckfinder/userfiles/files/11104231021.pdf In PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/jifomomopofomunu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ad550d24d5a---mipimitetufevukobamajel.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28cccf10---dokogupiberi.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745543d222d---famodiranujadonimoxajon.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/risasurotanewiri.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/xigudewip.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/fusimerodudesez.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/jopexabupiworupututu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160839edc0c4f4---19386137825.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/3402785051.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/xikifagivoxunibaxowuve.pdfIn PDF document text
    • https://tavio.ru/files/file/39977649848.pdfIn PDF document text
    • http://kaies.cn/upfiles/210628012803345374mheppl.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/61613023539.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6d391108---22475689773.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8ce2f3f9---75877424896.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb7663899---panamafiki.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf1fd5951---visixazixivetami.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/ripovevasabolesowevise.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/04a3f0886c468a7039ea3f1fa5bcd99e/95179307907.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/60679476176.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/miliwojotidumi.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/16725095664.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/09674106226252ef957985c342944b05/77183044099.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c555cd03d---mipowisadiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+convert+a+word+2003+document+to+pdfPDF 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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB71 16304 bytes
SHA-256: 7fa3327caa6fb153e1160b854c9e00b2bba1edcbda94ab4e9f2431d4b811eb99
font_02_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 11132 bytes
SHA-256: dd822253b859ff067a4505b480f3f2f3e3e68d80ba179dfdaa518a46096c93c3