Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f9eab28446084…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 08:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ad0b7d739543db3e9f8bc5260de5864 SHA-1: 6245f1f3698390abb881343f56c3af29f40267f4 SHA-256: 6b6f9eab284460849a0c65fef069edf17135208851cd57c23dcf2ff51354aedd
116 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the SE_CALLBACK_LURE heuristic confirms a phishing pretext. The document likely aims to trick users into calling a fraudulent support number, potentially leading to further compromise or financial loss. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may serve as a lure for a more complex attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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 http://etpatatietpatata.com/userfiles/files/12599612635.pdf In PDF document text
    • https://an-professional.ru/img/files/file/xonabavekepizu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a537e959cdd---kodegujetozufitadox.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/juxusenatitewunezemo.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/9413222367.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/68507417198.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5317a214b7d54edb34ac1a668d4d8229/rutorogiva.pdfIn PDF document text
    • http://nineslash.com/user_file/file/15441212520.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/sizagidiw.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25045537692.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b215a09512416986c73f4e91df01deff/detej.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec1b3049d3---32345639404.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/60872650125.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e0258291293be6a1f0f95bbd4653b2c7/perotoremenitejivewum.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/61899598024.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c686e68fd---65083404996.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/69813401648.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afddcc2ed06---47375360369.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/50738295652.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608529b98ff55---xujoja.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c8c99a59a1deab9ac5286c7d3b9a39a7/mamadaneri.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/t9pasfhhbbbah4kk3cgmhobra6/39733029127.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/gedasareruzubajovivibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=python+sphinx+build+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_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 10656 bytes
SHA-256: bd463f35a63f3a718854e7d414b23de9f4f5606b67039782aed9f7047cebd25b
font_01_sfnt_off00010733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10733 18600 bytes
SHA-256: 1138239791f49c5a593d382dc8999be09a6f3d5e2bacfb1f0edb18c7ba384df3
font_02_sfnt_off00013770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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