Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f77319f35428d5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 06:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7ff147f696fbf3bb0d922a5e1801e0c SHA-1: 01fcd8b90c540c400941ebb7f780ac900a82327a SHA-256: 66f77319f35428d5ee0096f79b30a7523a720054af0c67cc6a555aa23742a585
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to potentially compromised websites, including a WordPress upload directory. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the presence of PDF link farms and the callback lure strongly suggest a phishing or social engineering attack. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://tidymoney.com/ckfinder/userfiles/files/xurod.pdf In PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/67073815764.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/mizudawagesuxugez.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/werotulesipobod.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/59689820657.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/gaveluvugofekawo.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/18599721866.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/kakedise.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/94847419699.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/sijetowudiwozisujaxuw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef50d1b9ba---54736911753.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95620543456.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210909194921_mhgn7o.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1phi3tno2g444cefkib7ejfjpj/tedij.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gofopiwepagoreb.pdfIn PDF document text
    • https://norservis.cz/files/files/20750909320.pdfIn PDF document text
    • http://special-pharma.com/upload/files/nusobu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/bosawapunabudidujagojete.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopuvejafebikepox.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133266c84abf---tilonamakuzawonamo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/rubivixomatinek.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dopiwumotan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=justice+league+season+1+watchPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 16852 bytes
SHA-256: 31c92413d42010d5f62d5c84f592029728226740ce8f385c9571071aa1ad455b
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 10636 bytes
SHA-256: e942c626edf51d0af9e564405f4e355a1a744e005098aac7f6ef3a0b2f69d76b

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