Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3897ff4f76a7b01…

MALICIOUS

PDF

101.1 KB Created: 2021-09-06 12:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cfadbb45d34ea1dad85e52d9f0052cb SHA-1: 3f739c5a5cfd181358f0edaf98af30a6638b727d SHA-256: a3897ff4f76a7b0181131828930a7e3b7425e11dbbbf36b2272a19468260c795
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=delegation+of+powers+rules+1983+pdf PDF link annotation
    • https://bosingels.nl/ckfinder/userfiles/files/nesixagopupinowatinawe.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9d7bb543344c6c81859bc9ac44454382/zagujumazikikedabasofi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0246c6916b---xatumadanopu.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ul6m6qpjnogh9hk6e3v9ovnca3/55094844124.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/loxiwunikavewifasesil.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/39501275924.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3827c88354ccd70189f045c84c2f405c/15424811658.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/d88a6023c972c1b90a21d3484ba3c766/gadus.pdfIn PDF document text
    • http://szwygs.com/upload/dokuloxaxenogixusefisizu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/63242066755.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c43409d18e---nuvafepefasib.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/batutidetofalezizabi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/a5cig31areel30rqlugtph4f05/40389267697.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb3298f69---2564148552.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/kibuxomujerisaw.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e3bdcc3038614e1a4bb8941df56350c9/19962358718.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/90294b5dfd98e8b481110f1bfe893192/61108221391.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2dadb509e---lorulusulateganugaw.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/zawuwap.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e93370768---lepegeti.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/93973534747.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/xemoxoredekur.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7cp26d7f5li3ckfqhbcf86gs22/xawitifobaf.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/zuvutusemekerumuzogimije.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_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 21652 bytes
SHA-256: dcf77ab8a91cafe523d53e3276d73e9b31dcf8739871cb94404a259e33fd9064
font_02_sfnt_off0001696d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1696D 11460 bytes
SHA-256: 298203f61dff57b76f1bea6580e83aece603e7751dc47ae6b5480516ea890f0c

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