Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1b1785eed3b1f3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 17:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c23e02311f285502a2b7b2aa9272f870 SHA-1: 2bca688bf9454a25dba8d9ca2653094ecc230591 SHA-256: 8f1b1785eed3b1f32870bc0d303b41d8ad0aaecc453230df23a5a5e5f2940e91
176 Risk Score

Malware Insights

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

The PDF contains multiple URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam context. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=india+ludo+apk PDF link annotation
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f2a4f85b---vudoxotizapizovisagupag.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/41329868663.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/mudib.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353c2076f66---fedutesuboxud.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bukotonabakagujenajonamug.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/xogaduzekejamexil.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/9639799114.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/81131173120.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/32445168696.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/6570158040.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ca3f1c17911b42e606c5b441a648eab7/7512619936.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/tudowasakolereku.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/ridek.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/vaxakiwesumadulotifimifu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec8f20c6e---45234493672.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/pevevegivudejosomomenaton.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/varutuwuxix.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/wejexo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/22612404578.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/80537408594.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/lubonizikezalepim.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210910171922_l10496.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21898141349.pdfIn PDF document text
    • http://104408017.linker.tw/files/jewasokexugumosuvawik.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_off0000be31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 10032 bytes
SHA-256: 6395357c5304f1276f5b8644522b7290b183eef3e9f53f1fd8d8cf08e5755ad9
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 17580 bytes
SHA-256: d968cfa029172e99272bb094ab72d13658adf50bf12a195cb02c3bb259ce61f7

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