Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d24b4896d426ea…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 19:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7a1ef90cf1b7f96b1d9bd20fefd3380 SHA-1: b66ea5f1e731df4013143af2e0ea4ce037049a73 SHA-256: 87d24b4896d426ea2bd2d31bc5a784f6a5cdf6501df76ddd74367ce35859d131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=zaner+bloser+handwriting+grade+1+pdf PDF link annotation
    • https://sahyadrisevasanstha.in/userfiles/file/78573686278.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/doruvex.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/xokigejujanarapizamom.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/p6i40s63df42h4vmn5bcvcmjan/16878921438.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/00767223d10c117c01aafb7bcf833a7e/videziwelexitu.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/dodobimumezagabafudeturo.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/ripuvegas.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/000d51395549b3fe51eacb25c7556792/85277181665.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bnv3cu790ah2lq2hkavlm7mav0/26571836512.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8653fc55cd---11344945954.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5c495245e558ee4abfe58ccee0d19167/zugixukageken.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/romoxunew.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/53752391109.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/linipipizegamu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/nepugutinegowabinika.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210602112909.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/f8d77422b97f87cc196bef7b987196dc/zikip.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/jazaxox.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/74302942076.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/37426004989.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160faee35b39c8---fokisuwuziwag.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vesepenuxupo.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/56713467707.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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 11020 bytes
SHA-256: 56d1d56d4ce83629230009d030032ac50e51fdf4a5b8d998d086255422a35a5e
font_01_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 16936 bytes
SHA-256: cb1520f8d59ca16898d7e821c63d6112c92ea5f17dffbac9ad71c93ac6657389
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.