Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e00a9b35d327cb…

MALICIOUS

PDF

68.6 KB Created: 2021-06-20 16:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5effdb81a715881256668590dfe236ae SHA-1: 39c4cf871e8e3f87e24d93d5ce3cfa68d587891d SHA-256: c9e00a9b35d327cb1c139d55ec0e2aa9d82bb6276aad766e033911f884390b66
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'Land rover series 3 parts manual pdf', likely to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/np5skmdsp74h8ghv8najb049tl/tenomokoda.pdf In PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/33002458036.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/665e405c1edc20617eb76938ec571aac/24281623511.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210606191801.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/botefo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/870dea5fe0b67ee507f8590b0235e5c9/49317063981.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210527_9F197DA067CEF0A0.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0fq9deks1e2rdpfm6pj2q5u3vm/14716934878.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16089364fbf46c---takilabotibemubu.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/5527010679.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1cd97b31ecd5b16a110142afa8ac2779/mojamufadopufubod.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/48856723927.pdfIn PDF document text
    • https://kildevangen.dk/files/18002261514.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de88705a85---kegesakerexepedimoneged.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0c8dc0b1bb1c5e5c8f6997dc52cb1edd/48284745920.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160841464a5c63---judigupexuxumanadofeweb.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/YTWXjIUwRh0/uplcv?utm_term=land+rover+series+3+parts+manual+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_off0000cbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB8 5352 bytes
SHA-256: f75b0716453c1d5dd22e554fb56ce5c6202966354ca09e9e764118b06b82f36b
font_01_sfnt_off0000dde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE4 11860 bytes
SHA-256: b20e752fd5ba167d3bd1ab6618c43bd7df6c643eda0bca31ff376b3abb5ff2ce