Malicious PDF — malware analysis report

Static analysis result for SHA-256 83207ffdbbe652c2…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 18:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11aa8d1078695a06566cabca21a84061 SHA-1: 85d294b8c6a9fc1e50efd92e36c71fc746385747 SHA-256: 83207ffdbbe652c23a056a247e5ebcda050ece7aa0643c9aef533dce326bee7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to direct users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://aaaexpressac.com/userfiles/file/55422483659.pdf In PDF document text
    • http://richmediahouse.com/admin/uploads/file/bifukip.pdfIn PDF document text
    • http://teplospectr.ru/images/files/17197256939.pdfIn PDF document text
    • http://asja.ua/userfiles/file/latatadu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5c4emse55b7k7oqt82cc0o340a/1917546173.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160750b6187672---nigilixapivoraso.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/q9hui6t11ltglfuhv7h8ch06r7/golujiterudozovupanix.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/56279869027.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/detalunilokapejevizi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/e3f9a3oejn0918342lj0ro35il/zemewidijedur.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/b962114ab0787a3cfc7e2c1e2283db8f/lofubapojedumotujelagiv.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074951f93af4---21945899575.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/tuzefuwajipakozove.pdfIn PDF document text
    • https://abss.pt/userfiles/file/44665353877.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/14216188616110fb207976d.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/77336770185.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dtcpt0mi9739htg24ek8qvjm8o/rigapeboxenel.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/31681527345.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210620_494B77E27EC3FC95.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/eff0f431f618358335e9f0eed7c565cf/54461317902.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/69292635160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+love+you+lord+sheet+music+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E1 17820 bytes
SHA-256: 45759b2213af7bd255fdba92d62843a76ad2db5d0a0ba514554a9ca6b8faa514
font_01_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 17308 bytes
SHA-256: a136c42035aebdeaa1ba7550eb502bf6e6d23e3f55b6f6eb1c0d1a619bf37cf9
font_02_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 10848 bytes
SHA-256: 423538f84ed2b4ad6454d6051691eea747dc62ad930803d1a92f8eb3eca07608
font_03_sfnt_off0001336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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