Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b4804639b98d3f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 15:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b60dea4d3927ca4512e36a73700a074e SHA-1: bedc39c0138724e71df1045e3b6ed92c02757b71 SHA-256: c1b4804639b98d3f244ce4f2bdf513b56bc82f7eee2ed63bea85075e4a1b672a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to direct users to external malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://oniceh.ru/uplcv?utm_term=word+search+worksheet+for+1st+grade PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/vupuxawawifojo.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/56750602465.pdfIn PDF document text
    • https://aromamarketing.md/img/files/28986494092.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d245d8e3a---zigobememumezowujikikan.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fafokikizutaden.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/68135559207.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e7b65237e---wikebebolatabopu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/70588901070.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/d2a8b63f2a3d5532aa12033aab8fe2bc/93792336051.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/95185928508.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/47562601791.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/safasenitikomepuk.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/67783820775.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0cbf932009b4de34683c7efb069f1847/6387646161.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a21628583c0---49000467409.pdfIn PDF document text
    • https://zhansq.cn/upload/file/27970006761.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/lununonetunugabefato.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/oikpigfjble0oms2kha031ukt3/42560325684.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/11442651884.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cfef1801a07471ae26bfb09fe5153668/31725507265.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8487524713---25747035321.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/vurexawojinotutobox.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/30836384496.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/dujedifupine.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 17404 bytes
SHA-256: a0639b18b8873f754007b4c59ea3e68caeee2684bf9405a741390bf3734a0f65
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10736 bytes
SHA-256: cf968793abc4d1753584ab54a0bfedf6d676112200c9e02970e510fadc46df10
font_02_sfnt_off000120f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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