Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8673b556398a3f3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-22 17:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ac2f2ac1898f49a8d6e3a2e3d66af80 SHA-1: c3db2dbcfded3d009e7709100a0197e3dc3123d6 SHA-256: f8673b556398a3f340e64c88161aca863875f68b9d5ee9316be0093e276f52c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=kawairun+2+y8 PDF link annotation
    • http://tofuyatogo.com/uploads/files/89961698501.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613022c7ed30e---nejoj.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/98c2e03b6bc1baafb54c20e10db84a3e/15106286727.pdfIn PDF document text
    • https://fratellifurloni.it/file/70130526994.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/56334626942.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/50253162854.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/gekovapim.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/46719470554.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/68211133777.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/baxosotiseduxipatowa.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/47be7147eed237202c25bf3d68b0e0ce/saxagoxafadamitiwo.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/21513191343.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/1855401320.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/31625180453.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469307bff2e---matafanuwowanikokiwej.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/xuneluruzate.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/domenegalurovefareseru.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/61337750052.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/37448220433.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/laxerep.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/96627595773.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/dupusulumivasexidanovisel.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/gilibinikur.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/ramenekonifetenateruram.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/72856841893.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_off0000b6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 10156 bytes
SHA-256: 90fceddb227f5e7ef96e69ca7025b76223c025798303d3fe30ff2f8df8d779d3
font_02_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 17120 bytes
SHA-256: 92d29fa6caf0df519515e8ff6f80070fa3e594db64ea86bbe50cb01067333f5e

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