Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fc3e647ea058bc…

MALICIOUS

PDF

72.9 KB Created: 2021-09-02 13:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df95bd40712079a79998c91401e03ac5 SHA-1: 09384a4bf3c665f1d729b0cb1767df471182d878 SHA-256: e8fc3e647ea058bcec6df68387f53e74cec76872b7f10e458e118c41295d4503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to potentially compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lure users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a756fc13ddf---3071891407.pdf In PDF document text
    • https://godahoian.com/app/webroot/upload/files/kalaxamozulolexamemaze.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/jekorevuvagi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf43e13420c4e32f72c5042658303345/31435284924.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/rexovikoleworamopinixi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ag4smd8nm17af8i7opsb4g54mi/remeresuxokevali.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1626238169sarujofepuludet.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/tireravunudajesaduk.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/850b53a2139f7d2901149eebf1ae1329/rituko.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/24866794447.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/lotejobipulajupudikixam.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c356affd2544b18714df0bd8aa5b2013/91522469970.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/golofomimapabowuribowixa.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/zawokidomel.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/goxoriruw.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/72877135467.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9c0e9f5eda7df059c0dab6c15ce4328d/kazetanovupug.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///99663171393.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/kafagogefev.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cec41b1a4---67931649474.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a30392c6e3d8f98005cf9dd8c4b16682/81843311117.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/rigijelesilegutixipite.pdfIn PDF document text
    • http://zamgph.com/uploads/file/23161244495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rsmssb+ldc+syllabus+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB477 16504 bytes
SHA-256: af1e54bf9e0b6583a8d936918750ae23aa7ad6dbee9e598113332c05ce88a66f
font_01_sfnt_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 10536 bytes
SHA-256: 06c7f0932195067ece54079d643af434a4e49e9efd9f61b66446bb5dac175156
font_02_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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