Malicious PDF — malware analysis report

Static analysis result for SHA-256 17510b5382aa5dba…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 15:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2e13ccea4acd1b3a7eaec5cce31fd43 SHA-1: ec4228ced12f1dfa9e462b30bc09550ffafc6ae7 SHA-256: 17510b5382aa5dba1dc403ac3dbd9f2d4281843bc5b3b525ee4e110379540bef
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of these links and the nature of the hosting indicate an attempt to manipulate search engine results or distribute potentially harmful content to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=comparative+adjectives+quiz+pdf PDF link annotation
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ac5d504110fd25d5b5344109740bb2c4/wudonidawipi.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/pqr0hfg835eca3pqjr1tg12ec1/66743656504.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/1561132ecedb7f7333716eadb74ce8c7/pogofemewujagevutatusuzin.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d222d979c8---jixudidavodusoxixib.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/15179251396.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/pudemonugogawizuvemoko.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/6010918662.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/gotuforebipiviwi.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c775259c90a---jofawetudegavitefidoganim.pdfIn PDF document text
    • https://thepainter.asia/upload/files/1335314469.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/gunalojipifabiweveg.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/66427519912.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/57305631512.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/39004816633.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125af64c528f---13001732303.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1uss914acj6hl3uiaof0at5gn7/84258689580.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25528d89e0---soxitijimenozute.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1203705b0---45242196506.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/jesedobibuwufuruf.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/in3ojclbd5nghpn009i6dncd5j/zabuvono.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc92b1770c0---80342427655.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b2815503d---kifotukagebipok.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/riwod.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/91e7d90ff88fb8051af4834f8d374897/marenok.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d20252c0627b72711bef0981eca6ca19/65430218095.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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 14720 bytes
SHA-256: 39678068ed2b777d0bb9e3a7348b02d76dcd40177871cbc77e6a44a80a13d367
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 11164 bytes
SHA-256: 6cd24bccd061b1ebfb8d2ea7ddd433036f51b53fb8deb7133ae38a241cf819db
font_02_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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