Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b86e3cfccf3e5a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 17:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b629ae123130ffaf77b764c136c6979 SHA-1: 218b86a103c3f6efac269b04f05a71469084f1e9 SHA-256: 70b86e3cfccf3e5a842a82ee3886bc4e4bf74edaf02885d4453e6baec65fa2cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://harrisitalia.it/uploads/file/kexuferalabetamobebebug.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/93904130705.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/46720892847.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161038772377d4---80046820543.pdf
    • http://agisma.ru/files/pages/files/62615220689.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1a346b10---lizolu.pdf
    • http://pnlestari.com/visitbali/image/files/sojudamuluwubagorinake.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf50eb7f93a---80284084381.pdf
    • http://studiotecnicobonoli.com/userfiles/files/sodowawenakutewukokuf.pdf
    • http://shipagents.nl/uploadfiles/file/54996543415.pdf
    • https://mygenius.ru/admin/ckfinder/userfiles/files/51997477023.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/a7u6fb4v1l6jmmdcdemrh0ma75/69972114585.pdf
    • http://etkindenetim.com/resimler/files/mugir.pdf
    • http://joltiy.ru/uploads/files/60589502710.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8baded103---49701303105.pdf
    • http://aloeverajuice.cz/files/file/buzezilulogameparetonogo.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/29772236470.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5020bb19---53103056362.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3edd48ef---72350604006.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4a7b1f5di3pvcs6faa9vkj6hre/45262328999.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i0pnnkun1kh0r2rthhoffrea7m/5929239836.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/1ceb04ff517314889b593d0b225d9697/73808968912.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/kojasadadikivorajexu.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104bb3a2ed8b---93481934999.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=delhi+tourism+places+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ea.bin
921c03a142d8cce4e6e7ca1559a5cb9388726fcd84e4b6dee714010dd2a81287
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 10884 bytes
font_01_sfnt_off0000e117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 16792 bytes
font_02_sfnt_off0000f929.bin
544580830fa6510a19fa6eae8a0bcbbc1b62e0573ce67ce552fbb5f1b48b8116
pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 17528 bytes