Malicious PDF — malware analysis report

Static analysis result for SHA-256 92756229ddeea354…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 02:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0767c2748a027de27edc867b1996a7b5 SHA-1: 762b46dab5421c46d34d941fb911d38d58228404 SHA-256: 92756229ddeea3541b9c89d45f2ff1fa6e7c4d2c14e6de276e8920f89b2b206c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users through multiple compromised WordPress sites to potentially malicious content, as evidenced by the numerous extracted URLs. The PDF structure and the presence of external URIs suggest an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://ketchas.ru/uplcv?utm_term=top+android+rpgs PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f824ea34afd9c9370acaf36e5c21c504/taziwoxapo.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/18261219760.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/20516659920.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/manugin.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4fce0bf4d---7909294296.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/famuzupemaduzugiregipezu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/xiterake.pdfIn PDF document text
    • http://a899.net/userfiles/file/70776466042.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gopovalojudepewumidu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/jatovetakusudobimozave.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/wubukotomenukuzokebotika.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/wuginudijegeri.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/10390161539.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/90384797386.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210906114215.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305e70a7e30---vogifaxilusipetisew.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/busikasiret.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/pijamakolulijuvevawebafe.pdfIn PDF document text
    • https://pokereshop.cz/data/file/36459253039.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f130ff092a---jitopudonoxawi.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/39382399198.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f53dc81e---28397559577.pdfIn PDF document text
    • http://carbonelite.ru/file/zuravexovopeputupus.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136745a47217---jovojexalurabiguvu.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/namalugovesovejedovifoma.pdfIn PDF document text
    • 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 17208 bytes
SHA-256: 824dce90d9161ce681d562b8823bfc5665497b63bcb7f0a2eb07aa34057938d1
font_01_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 10256 bytes
SHA-256: d6db64ba27a914f4ba01be5b7e9ed2b975adcc1f18f085c05bfb0bf90dbc0df4
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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