Malicious PDF — malware analysis report

Static analysis result for SHA-256 28667818690d0778…

MALICIOUS

PDF

67.6 KB Created: 2021-06-07 07:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de749f16ee0e7bc07b29880ea6181343 SHA-1: d56eafc2339c3317de776ad78d77eca4acd76b1d SHA-256: 28667818690d07780e32cc00ea9bb538bda88d54b27e2a56ec141d10b6956234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or malware downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=departamentalizacion+por+procesos+caracteristicas
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607029e7c4ab3---35291051067.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094497f734ad---zedoxinegobabiwerexokodo.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb9d0c3bb---busanalowebowodegotu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16084ce9f398d4---nozuzalexadisenin.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/62762993397.pdf
    • http://skiflogistics.ru/userfiles/file/kepetugujimexuxolage.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6995d02c---jegexegevifod.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609427649c51b---34494067297.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/99456230422.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160754d5e23456---67817884534.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16079d94ce20df---59436318417.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/miginufuribuwi.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160989f31ba083---logajawekimotufepitu.pdf
    • http://dgjst.com/upfile/file/kutul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caba.bin
f771c6ea3617fc28022f372e4fbde6b4129ec0cce3dfa4b1b6a3347268aac5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 5128 bytes
font_01_sfnt_off0000dc22.bin
1dfbf3fa04459a958661b5e2086eb9ec01ae47d9011857eb990f2b7f5b37d0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 10932 bytes

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