Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb8204b4d09c47a…

MALICIOUS

PDF

98.5 KB Created: 2021-06-20 12:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 87f82190f34160ff95d5e44acdcee20c SHA-1: 1357035ad21ff472b55a29d3f90afe981f41eb54 SHA-256: 9fb8204b4d09c47a90330533a9cec356e1a83dc5e56a5dcc07103e7aa6c94cc6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to disposable hosting domains, many of which are identified as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7e927092db0c3a86af1be8da83043646/20093762991.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608060bbe806c---98519305745.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2d2630c0---pexasapefuvuxat.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/79670461974.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o91qf5bu11ffjihjk7520niq5b/ropaxuwovedugegokororemu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c155b2c77ec---61865119688.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1u9c6ahndkdujcd9s4d276p5i2/89553722879.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/batizufitaxa.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7d467f8c---18778326936.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/o65vpumf7e6gcph34e3db2co81/76946730055.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a2886c497e6d7a92c183a54c2836b063/tibofunarunowezezo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/af29621bc1f556e3bcdd2b31e8379a82/89513631349.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/35551353688.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5d86794c---44232053679.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=think+and+grow+rich+book+review+pdfPDF link annotation
    • 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_off000143d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D1 5512 bytes
SHA-256: 31b2769bf2b86b26d7022907dc7452ce5a5fb23d8d7221200532ef69014f3c17
font_01_sfnt_off000156a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A8 11452 bytes
SHA-256: 340721011d492b8382e64849d4820ad766e6043725be813b9bc819b6a72f5afe