Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea25de1536d7f69…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 675dbbf3e3863a8ce40f1b212c83b52e SHA-1: 5e0c4eaa22013898600d28c1c4c95ef5bc3aecb5 SHA-256: 9ea25de1536d7f690075b10bad8a6f778dc4c579c58c8cf353af5fcacfc7494f
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports a pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=principles+of+corporate+finance+global+edition+solutions+manual+pdf PDF link annotation
    • http://www.addvanceo.info/userfiles/files/98673936891.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/3724468855.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5513bc17---kiwila.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/sifiwotin.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e69b2dc833bd1bacb6e1ec99b450c3ab/75524391663.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vnguhso35aipc614v665990mc7/jinazififemu.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/25073302345.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mumet.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/fovigenuxarokunutiwor.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/76653948286.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/88168671012.pdfIn PDF document text
    • https://anakmeong.com/contents//files/25842438942.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ddf10b93c53188c179bad6a398bff310/matuvajewapu.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4a34b8b04286059c7a1fe69dd353af4c/lajizakodusukor.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/2324753881.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/mibanikuzigawow.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/wapagowazodopux.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/vadafofo.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/54752268579.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/21181ba832dd5b0db9704fa7eb776e9e/jawolasujukimaxiv.pdfIn PDF document text
    • http://kag.fr/userfiles/file/90728222177.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/wopupazenilasofebonapipif.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_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 17556 bytes
SHA-256: 115a7fda72aaaa9f36921596ce1dde57176ac7783f78fdf3fadfbc4338e988f3
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 11204 bytes
SHA-256: 2f81322d37a262c6e5a4121fd5a9d30e6e4aefeeecf88306d285591e16cc6a2a