Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2464f39d9ec79e…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 03:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6fbe10631635aa23925b36d1cad5ef4 SHA-1: 65ab07158c362bd82fdd2f4473d62280733114b0 SHA-256: fd2464f39d9ec79e6f5ba3f83374f9985e8ae7815004453df4c14f9a85be7bf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=thea+stilton+books+pdf+english+free+download PDF link annotation
    • http://xinyuemu.net/assets/202106/files/20210619114734261960.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/52004678322.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626954b8b3---54362166215.pdfIn PDF document text
    • http://sinoorchids.com/image/file/lefaderagebugifus.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0d2c83928---97000681201.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/51105984455.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/72948032917.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58485473217.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0eaa0bda---96050536807.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/lgjee4nin1r783ukcqhf8c8fpsu1ije6/rirafefunenigijifekoxiliw.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/8321781992.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/78cecf6e283a6038693b72ad0cc420e4/62749803538.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/wejemejovakirivunumit.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/20839818812.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/5128856221.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/maliwagipunusope.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3cb0d6a645d3ff1a54e4b6ea370044af/viliwezexabidivijurara.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab55a00c576---redexuxiz.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021062407264170554.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/672821a1c69dbb6ca1ca9f98bb20c333/17121687350.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/1914252765.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/20851a54bf604b38ef6e56e91a9f6ee0/23451699507.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6afa6bdda7---kixinibu.pdfIn PDF document text
    • http://dakmet.pl/upload/19469663636.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/3c370c1a9ca4ba200f2de8a0873aaf9c/gexosopubutegurew.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_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 18104 bytes
SHA-256: 7a5a9a8a08b86c8e3c93508c77fa66bd438efbd0dd85f934af438096cf3d842e
font_02_sfnt_off00013d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D04 11060 bytes
SHA-256: b3b37dc725b69221b52de68d0ff2ea6b1740b2f528606e7c7c67cd4be2a5ad2c

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