Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd099f124582d49…

MALICIOUS

PDF

87.6 KB Created: 2021-07-03 13:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2920c0cbc2ea5477a2d1c309f7601aaa SHA-1: be25c3258fee1fcab5f03562a8b7ebe219c3a285 SHA-256: cfd099f124582d4952fa554ccca821373b9e7faec171b7b9a699a0d673fb1269
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest these links are part of a scheme to distribute further malicious content. The presence of multiple distinct hosts and the nature of the links indicate a coordinated effort to lure victims to malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a352989f3c7---bopelefokabawasew.pdf
    • http://lubrifianti-auto.ro/files/file/51546988991.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609630ea7b351---58844882900.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4e11d0fec---kalafitimigelexitudawuje.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d3ad3abf2c6d8d0c8f68e51725dfbc01/36079145965.pdf
    • http://cobansut.com/userfiles/file/fofezelijadezaja.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/26181867144.pdf
    • https://aadharshilaschool.org/userfiles/file/suxofigudukixuzigijod.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/salnved2ca0qvnkcebts4qt6kk/39493688965.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a278994f466---93317277036.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/56s7lrelufr1rjn17pnmm7u9k7/tanoxasirikuwuvuzar.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/26odl8qvjv75ihqaj47iqtml3c/36324482889.pdf
    • http://icmasistemas.com/userfiles/files/garuwagumowizo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/487d9e23c5c1af0d77fcee3d4173e572/pewepiwol.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7f46e4df2b42641749ff3be7202ab31e/59317632968.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c24084d09681868bac37912ed7b32efa/fasufuduxekusemolovexus.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64bb42c41---79537625017.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094522a124c4---sezilutupupodufefo.pdf
    • http://campbellelectronics.com/uploads/dekejuno.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2fae118ffb29e343ad82434a4f4108d7/8068954650.pdf
    • http://zovsh.com/Uploadfiles/files/32028580078.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42635feb1---56741062427.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b4812823151c687416a3a263d1a814ed/nifowatariwozedavupefo.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd5a154df---59118285759.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d311009f5---72746604278.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/32b2226a0875856740fce8f3332dc9c7/57688504409.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=there+is+no+in+love+and+war
    • 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_off0000f404.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 16792 bytes
font_01_sfnt_off00010c1b.bin
7cce6b72027e2817e3f2a1ac4c7cd246c30176e77df4dc30bbfc3ee5b4169af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 10360 bytes
font_02_sfnt_off00012379.bin
06b68ba5559708940292db05ed9caedaeaa51f0641bc1fbda3a6b5b96289bc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 17716 bytes

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