Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdc13e316e34a05…

MALICIOUS

PDF

84.5 KB Created: 2021-08-08 15:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dc8c34ace6b05f7ff31308770f52f8f SHA-1: fb7a31b3d3d11352c0c888af4426359aa1c524a0 SHA-256: ecdc13e316e34a054d0b80baf1e1a8fbcb0ed2c1ae85a0235f09627bc88090a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to act as a link farm. This pattern is commonly used for phishing or distributing further malware, hence the high confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.pics4us.de/userfiles/file/40145810420.pdf
    • http://altinay-law.com/images/file/galazupow.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865b5ea2075---23436087183.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/sixukugagezazuwuxufilix.pdf
    • http://aarogyamedico.com/userfiles/file/76889238218.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9775e1f95---jipabuduwezaf.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160919b6e5c1d6---kunuzakajeviwe.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd16516d4---82859129457.pdf
    • http://banlinhkienlaptop.com/userfiles/file/rodejanudileguzofulekexe.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/58b65b5811f2663db6261dbf79743d22/30386879093.pdf
    • http://accessiblevehicleservices.com/userfiles/file/30554355535.pdf
    • http://greatnice.club/updatefiles/file/42395070640.pdf
    • http://headrepublic.pl/images/files/17912423055.pdf
    • https://ak-oroslavje.hr/files/66518283538.pdf
    • http://cpbnatation.fr/fckeditor/userfiles/file/rurakesolamisavifu.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f56eaf480---nedopamuponajemodez.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f9319c4b---81937949497.pdf
    • http://www.thaiboat.net/image/upload/File/5196222299.pdf
    • https://schmitz.cz/res/file/66002346599.pdf
    • http://stressmanagement-karriere.de/userfiles/file/57043833500.pdf
    • https://carlojans.com/cms/file/4024782306.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f3a6b6fdf64a394aaaa05302d1530931/lisunivexisomosozevuzub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bissell+lift+off+not+picking+up+water
    • 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_off0000e9cb.bin
94973373f1f70a03500730738c50b370c9787ee3835040307770eed0386e8d90
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 15872 bytes
font_01_sfnt_off00011277.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 16792 bytes
font_02_sfnt_off00012a8e.bin
7daca1d4f5423f54bdb9316f65745619275a3bc138db0e4026d3a8b51d8f911a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 10984 bytes