Malicious PDF — malware analysis report

Static analysis result for SHA-256 df26c49e5f3f0fd6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-06 11:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7574e62680e6e1031cbd033d7860f7d SHA-1: 4aff7b39e0ece112593acf86b006cb3e395406ae SHA-256: df26c49e5f3f0fd6f708e72e61a8b88634a6b5dcc51082c8144b8b5ff36a693f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://vzwsportenmuziek.com/content_docs/8745768300.pdf In PDF document text
    • http://asfalon.com/__files/file/36409796618.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/wimeziwaxofuguzag.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/16747442648.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/widezogawonidonasuxikol.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/db0ccd535252dfb307d322782e625bf4/dalozuzuwogikumejas.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vanebukupemojado.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/93993921989.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/htvccs8hh5gnhi68ta43g2ntul/8783741785.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160732783f0d83---1736324145.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/51197912581.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/368981077611b9db1900cb.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kqrnq04hnok28gtevdf7dljvs6/depozaropilugadetulitomu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/jebotor.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e29dac44783---xawuteruzejogorubovuza.pdfIn PDF document text
    • https://htchninc.com/d/files/rinikos.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddeeb01cce---46668194545.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/4659338491.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/60090847323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=tetanus+vaccine+davis+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://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_off0000b430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB430 15872 bytes
SHA-256: bc9871afc35f31ca5e7bbd9437c228691d0780a1c3e7b2cfee33d063df98f7b5
font_01_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 10476 bytes
SHA-256: 007693c91fa86877ba0342fcdc91b7a4008d895645ae1237e02de897c328157c
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1