Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a798e5127d09b5…

MALICIOUS

PDF

76.4 KB Created: 2021-08-14 12:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaf653b4930d13a9932ba1c0fb5bcf45 SHA-1: aa5e28b731896116be386342c249ed85f2cbb4d2 SHA-256: 14a798e5127d09b5994969a563af50793b3092b696e3d565e1d6bd592c915a53
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not meant for direct human consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://www.xyoaa.org/sites/default/files/files/41050208526.pdf In PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gonufobuzabomemilub.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/topemuruwutuvosulopef.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/26393011912.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sakilakufejujusafusujun.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/91038943745.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/5j7bfe356u5fo0lnnhdfof81m6/baforodis.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b450dc5d929---30631109376.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9b6891eb8c45699c3d927361ebf432e1/670345277.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bqf2qrkbpb4pnb1ev4fl2lrpcm/30281734557.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ad152f73---pewewilezesutozaluke.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/4kftfcuu08g67brcgm0s0vm007/23984674501.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/wuzusizedur.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g34me04aego5132h3rbjifum8k/kopalisuf.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075849dbaeee---5988298153.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050219293061.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/91500606943.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/bosenotejitizadetusodev.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/mugadidi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/53545ed574de15e86ec532863c27550e/sopezop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fifty+shades+of+darker+hindi+dubbed+movie+download+480pPDF 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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 17492 bytes
SHA-256: d505c33b59697dfb76c2ba4e5424279b3cb983aa7957b15c79637614a51b75cf
font_01_sfnt_off0000f054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 11748 bytes
SHA-256: ed399a1ab155e63dd655d022a2e8b757892f55c6be6a348635a24195a4d19668

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