Malicious PDF — malware analysis report

Static analysis result for SHA-256 e590916a68cccf41…

MALICIOUS

PDF

90.5 KB Created: 2021-08-08 09:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7854bddb237336b280a31a1a36aceb3c SHA-1: 801a1ac71ffdb1ef6602dadc81574f1574bafe00 SHA-256: e590916a68cccf41ee2e99b81fe781105453c2843b6b6658b7810fd402796da2
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, including those hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness. The presence of multiple links, some with 'utm_term' parameters suggesting SEO manipulation, and others hosted on compromised sites, points towards a campaign to distribute or host malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ascensionchina.com/userfiles/file/91034416393.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/53073450435.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/43451469532.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b4ece8aeb---16469581662.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/11450181750.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1af8d7d9e---pijafirodamo.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/vewugipiwusukiwurufijuvo.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/e5fik71mnallabq3np8acabqfs/modosob.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/97236891764.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/kerotumolu.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9dc891f62196e6ec269f7654caceab7e/minetawutaduriruv.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edefc8176ee---69644646199.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/67013126496.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/343200761806a60fc4a125e64b728191/nanugamepuvosetunogilav.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6850fe2e---77391461289.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/kifoxixonelonizoreg.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd75356d20---35138321766.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a570a42608e---38675262054.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/34738195816.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/poxinekos.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d300d287120---gurezinokulatexetuvitiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+a+simple+resume+for+teacher+jobPDF link annotation
    • 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_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 11180 bytes
SHA-256: f4db7d58e806302b8d6d059dee4fd3d89939849f75afba6114434ff32cf1ab2c
font_01_sfnt_off00011398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11398 17668 bytes
SHA-256: 0b546494bf392eb898bacfc008efa3c50ebc6f7037d3bfeb94e1787ff156e046
font_02_sfnt_off00014201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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