Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa842be2bbb088a0…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 21:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a39228fb5c2b6f47a0e26f3c3cbb910d SHA-1: 732de4a0f6da75e26acb13f05e138cd35f12d67f SHA-256: aa842be2bbb088a0c6a39f69ede39c6dcf414cc18ab3030827930d4edd7571e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The presence of JavaScript suggests an attempt to execute code, likely to download further malicious content or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=rose+clock+live+wallpaper
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82a5a4854---78923159082.pdf
    • http://gabinetortodontyczny.eu/userfiles/file/tigivekamur.pdf
    • http://boek.se/bilder_umeny/File/96766680185.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1b25a3ca20064977f7cc8c3145c18d07/13982723223.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/48375327355.pdf
    • http://asid.rw/userfiles/file/wupowaxazatodarikovex.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc3efa0114b65b7da7e9e2a15f4ec4f6/45398575275.pdf
    • https://guruvinodji.com/Userfiles/file/babolezasobetaf.pdf
    • http://abwninemile.com/uploads/files/dixetixolamexal.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/3698044370.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffecbe9b4---88960550581.pdf
    • http://uptindia.com/newsimages/file///tatefa.pdf
    • https://sportcity.bg/webroot/img/content/files/65635696762.pdf
    • https://gloriamus.org/Uploads/userfiles/files/majafix.pdf
    • https://sportuna.be/ckfinder/userfiles/files/xipirubu.pdf
    • http://dspec-car.com/js/upload/files/jejak.pdf
    • http://avanti-kuhni.ru/upload/files/74543602291.pdf
    • http://handsonmontessoripk.com/userfiles/files/83779953333.pdf
    • https://eijo.in/ckfinder/userfiles/files/35744226385.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2556d0895d2cdeceed5523375f319a69/17505775929.pdf
    • http://psychologadamczak.pl/userfiles/file/85507240474.pdf
    • 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_off0000cf38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
font_01_sfnt_off0000e74a.bin
87d1ff6a26e60e9e373892c7dad1326e660b54539fe2b80bfa874ee7e31b89c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 19516 bytes
font_02_sfnt_off00011a7f.bin
e5db1c1dd03b1d563228c3c0e931c775b2ac05f939f91b7dc56ee953c7b5483b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 10452 bytes

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