Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09b86af37662628…

MALICIOUS

PDF

79.3 KB Created: 2021-08-18 18:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7838168a399d7eafc1d468ac72566a8c SHA-1: 191b02b41f1228baa5939f63295c09c30fd8173d SHA-256: b09b86af376626281186fcf474c9ddc9f0a894a609ffaf8f34cc883cdf7441b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=10.s%C4%B1n%C4%B1f+almanca+ders+kitab%C4%B1+indir PDF link annotation
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/aa10c445292cd641d94569d658bdee35/kezata.pdfIn PDF document text
    • https://blugarden.eu/file/xevajoguwi.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/41002671057.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/63727627844.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5385059e01a3fb4d125e2f884cf176b0/titiv.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad48c4f19e2---23206725668.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3kdt00b3flniird93rj6cov0ai/bagelatisajuxe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a8975a26---8264414557.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a23b5d906f91f46202cf7e77da923d9c/33656285826.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kmc73lfjko0qaehmnaedeq4mdd/92844837324.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tot6ndp7th055rb5pf2h0jst19/16072447504.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/71261743909.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b30650c313b---nixosotoxowi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd54020c245---wimamavitewolapigi.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/ginujubutewu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/92552664625.pdfIn PDF document text
    • https://moolans.com/uploads/files/xagimibepusesimelil.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/55b0c06a08117e55446f46529176a678/29926884346.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/54744369670.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bapisirotijogapomukofi.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/91990032288.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/23741964629.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9902926ae---80859625818.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6ea7c754f---78956458677.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_off0000cfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBE 18216 bytes
SHA-256: 04444e17d01a0d399bc11c0685eb1c3517fde20ca139d129189b20bedda9342a
font_01_sfnt_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 10940 bytes
SHA-256: de214abb8b571d80056d784052ab47d6875fa0e5206b19302923f664af6b1f37
font_02_sfnt_off0001154c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1