Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10fdf270d0c2d3a…

MALICIOUS

PDF

96.9 KB Created: 2021-07-30 15:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1efa837d11f1e54d801beb3d28f86fb4 SHA-1: 6f6ff731e39d70485bf5224189125450c19fc810 SHA-256: b10fdf270d0c2d3a91fcc7a86a7dca065835258a71779946ce2e72d42758a062
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the presence of multiple links on disposable hosting suggests an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document intended for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8edbe6442---34710018951.pdf In PDF document text
    • https://abofahed.com/userfiles/file/wavajufigeveputukotavo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/66921516025.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160796b25631db---81473908954.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/29252239952.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c5291a59---16972125839.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/9cfc223ed89cde19baaa9a4bed106a52/5468659411.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/xofabeneposakitesizixoz.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/57084617072.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c4bd0d3065e852101e99d5c94b059ebc/87637239763.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0a9541ba---29712465805.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8219266a4---84722550839.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/pipox.pdfIn PDF document text
    • https://abeess.com/userfiles/file/zegagaro.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b39f24433f8---riwapevekuko.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/wimifobipidoxasokogik.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f4f36ce0f---13253570016.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609eedc9634c3---zanamesunezuzisal.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/54555593724.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/lexurepimidudut.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021061519593570554.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/72962520982.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/27313944348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kiwi+bird+facts+mammalsPDF 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_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 10496 bytes
SHA-256: 1682e45ba0cfa0d37cdad2a798624fe44a0a00ab2e8163fca11c24cf5e662f91
font_01_sfnt_off00013038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13038 17328 bytes
SHA-256: 1b7220af37a3a77a58d4a045d59b7e9057785b5d2fb447cf139ee1ad99114c44
font_02_sfnt_off00015d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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