Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc703c843cea732…

MALICIOUS

PDF

87.2 KB Created: 2021-07-25 23:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6ce14f87bea15237203ec4bb8376101 SHA-1: 2a33371da8aa9d889cfbedcd1062988642927edd SHA-256: bdc703c843cea732e50d07e167320e1b4433e78ceeb6529e38f4cef4e5c8e6cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://virtualcharityevents.com/vce_cake/files/files/64711877542.pdf In PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/pitepe.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f5acd2e7---13006132847.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/2637829022.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/girepuneguza.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b568346216---10267806278.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac897db9d4---pemiterutoratipijasixifab.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0ff3d12e7---zelutomufajowejigutimuw.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///kufafoxarakevixojix.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c39e7e39d---43305469915.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c8830cbde---43620985331.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/73873336393.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bacb7e849380150f33a8327b5dc7b160/49153473299.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210628221446.pdfIn PDF document text
    • https://rajaunited.com/contents//files/89136752062.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/j6cgjcn6lu2iihiokvlapr7jm3/88639382338.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/57198c5d42b064ab0bdf19957928a3ce/detediruli.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ba42292882b6d5d59de09b4866d6727c/rowigomexupam.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/viwewuxodekiwozubato.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/92469800435.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/tupakunejirajijedujagip.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b4fcd4ebb---94780101875.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/3100038662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=libro+de+espa%C3%B1ol+1+de+secundaria+santillana+contestadoPDF 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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 17332 bytes
SHA-256: 1c98d86d4a8a1ae056ef505dd5b10f6ac8e6e7748b91bc00c3552e73216e88dd
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 10960 bytes
SHA-256: c929378fcf9857c54a2c7c3fcdca076c9a69cd648ba0069811bae52d5fa062a6

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