Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aeb8d126b8ad21f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 01:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d66ec79d8484c42b0e6fe4b41a37401 SHA-1: 39200901cc5f653a705669fcb886029c8b9e5029 SHA-256: 5aeb8d126b8ad21f9592bfadf3393526e30b2ab815b7dc72ee2dab7efd54b601
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts to trick the user into installing malicious browser extensions or updates. While no scripts were explicitly extracted, the presence of numerous URLs, some hosted on compromised CMS uploads and disposable hosting, points towards a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a detailed analysis of its specific content or embedded instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://studiopignotti.it/userfiles/files/19130780347.pdf In PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/peduj.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73aaf01c---budinikod.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/067aa0d7ce189dfd6059d13a182b1267/kasobotimijuwujobizuko.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/vupidagosuxusudisazaropo.pdfIn PDF document text
    • http://rjt1.org/upload/files/defopiredaxipita.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/25071231188.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/74391516226.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/najexaxogebofegilaraxov.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/17729736733.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/55633691172.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7963fd53---41674749103.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/lujizojuvexet.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/45678761453.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/tupawowekubonexivo.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/85092585003.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/xigemarotom.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/pizolewunubiwupalu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/xajokurifoxiwagur.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gopujalalomozigejinazuw.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/soxodewojividujavezel.pdfIn PDF document text
    • http://mcutech.net/files/23399350219.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/pemenokis.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364e0546a17---30038085370.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d210addc8078d6b67efeff7c0f5eec57/fumuluteresosexinuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convert+mp4+to+mp3+and+trimPDF 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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 18112 bytes
SHA-256: ba347da37f5c8161bcff3356c506efd8b7e74c1abbb284b3963641de17fb80e7
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 10688 bytes
SHA-256: 0936e50636995a726ea52869e2046e6532f3b3640b3834ce4458c0fa3cc7bc37

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