Malicious PDF — malware analysis report

Static analysis result for SHA-256 68554949d09bd3ac…

MALICIOUS

PDF

97.0 KB Created: 2021-07-10 14:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2593f6d382eec4e38528616453465816 SHA-1: fe9f80fe5916606f7b476eb0ef9cda7fa3fcaf18 SHA-256: 68554949d09bd3acce8979a7f99c07183fa7ca4ec1a3737fc1602571e5dca3fc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised CMS upload links further supports the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=nuchal+thickness+means PDF link annotation
    • http://profesniprukaz.cz/ckfinder/userfiles/files/powafuwilowutofe.pdfIn PDF document text
    • http://kbchina.de/upload/gubeverolexezakot.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fexazevegeson.pdfIn PDF document text
    • http://prosquash.by/data/4234916054.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/kulez.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/rawurulurugowogokimam.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/vosevasozije.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749735af66a---fodurenepelego.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f8d38849d6d5280c2cdcb14e5f8f7898/91360340093.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/78oqgbn9saapmvmpop4fcdp5f8/51820964102.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/54714264377.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/88889306079.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4f95c65b---mivipag.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/27511059310.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91742547449.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0281d7a6---78718310207.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a51ccd51a0---gojefaxe.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/k45slq13njeb85m08hb2thkdaq/39477948978.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/4347ee70addd17e6fafc9172a7dfabf3/pewuwawemopabebizeg.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d953c0d56a4---mitorapapanemituk.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/iq00nuj8ua3q3o1eifm7ho1e5g/70736969166.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/69424962017.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/8506728518.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/8d05918cbd26bde74fb60b198f8dd323/puzigitufufiviru.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/vekokofamuvewu.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_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 16784 bytes
SHA-256: 90e733425bf21aae78d323b3f0f6a3a9a3691c1461bd57b01c66e49dbfdb16ca
font_01_sfnt_off00014701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14701 10444 bytes
SHA-256: 103424e5d6c6cc7d303b769eb646a4923ce30c6615cf7ba3d2e439201f86f4ed
font_02_sfnt_off00015e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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