Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee88ae0421c6a69a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 17:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5be7bd02a9dec8f98396b0939a1d7a0e SHA-1: 5d9039dba0001f77f59b318ba13a06d9ec99c1a2 SHA-256: ee88ae0421c6a69aed136e0fc2f8524579f78fefd6a3573f0f9416c51a495486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://barefoot.pl/userfiles/file/854003765.pdf
    • http://wsospice.org/uploads/userfiles/file/file/11088480427.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/ditilifagebokudasasa.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd4edd28a---51571656927.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2m4v8t7jva5ao61t02cqnksjm4/49431054692.pdf
    • http://zenithmetals.com/files/42304280412.pdf
    • http://pc580.cn/upload_fck/file/2021-9-21/20210921091613610942.pdf
    • https://peintures-descours.fr/fichier/files/varisubalexegag.pdf
    • http://fourfoods.com/images/files/nenufijezijodurepusuki.pdf
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/91685922269.pdf
    • http://epoxidice.ro/mm/file/26758307305.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/18c8b379a031ed93d9440157b472ab31/xoverabujefukuzigutazas.pdf
    • http://www.sandipmallick.com/fckimages/file/98879993463.pdf
    • https://learn-atdi.com/uploads/files/kemiduxamapawonakix.pdf
    • http://inbjnews.com/data/cheditor/0603/files/97345824952.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/fixojobifono.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/12697107781.pdf
    • http://teleinwestor.pl/userfiles/file/43889825785.pdf
    • http://zzzwchem.com/upload/files/gajalek.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/ribubasenaribumijivi.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/fumozudezaki.pdf
    • http://inphilong.com/upload/files/sosilajaduradazobelulofav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=toca+life+city+apk
    • 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_off0000ae83.bin
053d518501133e696cf671662950c46e99388e0f0d77212d999635403c786079		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE83 16196 bytes
font_01_sfnt_off0000d78c.bin
4308fc3fd4d5f9e0fe4f83ed29a18266b6b89e81bc4016d158ac9e7e58abd82c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 10272 bytes
font_02_sfnt_off0000eed9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16792 bytes

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