Malicious PDF — malware analysis report

Static analysis result for SHA-256 956e4173b0f62bda…

MALICIOUS

PDF

69.9 KB Created: 2021-06-07 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 952ef6b18d77f77b6c661c78508e4fcc SHA-1: 638c4d6c446bc4c72f2a7a8e011b331a20011d5c SHA-256: 956e4173b0f62bda269a56f222f76de6ff53b55dc2990aa464f633fca8d5a00f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crewmak.ru/uplcv?utm_term=%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25B8%25D0%25B3%25D1%2580%25D1%2583+%25D0%25B2+%25D0%25BE%25D0%25BA%25D0%25BE%25D0%25BF%25D0%25B5+%25D0%25BD%25D0%25B0+%25D0%25B0%25D0%25BD%25D0%25B4%25D1%2580%25D0%25BE%25D0%25B8%25D0%25B4 PDF link annotation
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9234af9eff4d7c1f5863ea32ca2d6a31/16739215389.pdfIn PDF document text
    • https://airshow-bg.com/file/41908443942.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/29808040b566b4fb769af05161ebb6c7/16783893709.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085277072949---6015219337.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/101c1e9b023c401b76ef9c4d763926fc/mexivokufukixatu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cbb17dcaff---jipox.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a3993c9d---jodupifumojovajoma.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e995daa342---pelalozaxis.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/e02db194cc97ef1f780f1e13e66c2a7d/51766268909.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f2fffb6f645ce19ad8d478064d8287f5/58159396143.pdfIn PDF document text
    • http://mextro.de/upload/files/sikijikekoz.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/96586686946.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607091abcf00b---22418177252.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/8b00dc01f267b30aaac9947c3a0c40c3/bujizinowonasetek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC754 5612 bytes
SHA-256: 1d47b0d991555baa6a6a0b530289cf6d3a98b6b1c18c687fb2c03d6334f43391
font_01_sfnt_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 14876 bytes
SHA-256: deb547a16bc785ca70106239c46075d924b9d35fb1874b85a9d52b06c5f93b4d