Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eb4e45669a0548…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 23:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad46a2c1d2d35b349184cb86b7741516 SHA-1: a8b3872452ae730fefc98a8b79cd3b28f32ab9c9 SHA-256: 16eb4e45669a0548286e276e236b417ae76483489f273e2ea8c7ccfb557ab94f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites hosting PDF files. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. The embedded JavaScript, though not fully detailed, is a common method for initiating such social engineering attacks. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160777eeadf8fd---berid.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/icmg9tisnldltdbllr6kd9r6k3/33391981859.pdf
    • http://nanumed.ro/uploads/files/zemisurisekiwuwezobeno.pdf
    • http://all-vehicle.net/js/upload/files/mijulutirobixa.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853f0d6a607---82618289907.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7ageoj537mnrllt9ijmq2ottn0/suvede.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/fd8b798652ca70103e3c4838bc92aa0b/fajatuvizesumozizabo.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aca73e1145---xanelopug.pdf
    • http://www.aqsclimited.com/EditorImages/file/bazurufuwifilegotim.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3878e5ad8---98374952408.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa7887518---22869929846.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e9d5be04cb17bf0d60f33592528823f6/70686725222.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e69a8d23fa83d94d949b40e727f18890/17227275136.pdf
    • https://dycmc.com/DATA/upload/files/202106140857407440.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609673edbd50f---poxivo.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5d9063ae52dc510fb4087f14a138766f/selofobabidadojudebet.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830fdb66860---52964172772.pdf
    • http://gmei.lt/ckfinder/userfiles/files/sepowivamaniwev.pdf
    • http://metaglas.kr/userData/board/file/xebemapufiwefedofubosi.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0a26c147---tetas.pdf
    • http://vinmexindia.com/uploads/rozuwadejusujuwuba.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/73859775323.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/43818919715.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+do+you+screenshot+on+android+tablet
    • 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_off0000f3cb.bin
006ca5a689975c6ed94fa50c196460560a93168c5c95f66ca539210496a2f30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10896 bytes
font_01_sfnt_off00010cf1.bin
cd36baa229e784c80f9720c134538482a4b896d21ca8135a7828444073645a4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 17988 bytes
font_02_sfnt_off00013c3b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3B 16792 bytes

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