Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc718a5778e181ff…

MALICIOUS

PDF

85.3 KB Created: 2021-07-26 07:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 711e4fb257f73c745c8eb1bfa43cc801 SHA-1: f51ffe3028901367b230288bb8d67ebcf326e116 SHA-256: fc718a5778e181ffea452214192b8a1a0dbf1abda88f71b136103945a8c0c460
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to various websites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an intent to distribute phishing content or malware. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hyeminshop.com/DATA/files/lafodefuwekiguv.pdf In PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/92969903222.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/42659990997.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/16563351915.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/95743776038.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/53f88c4487f931402db729bfb7c651e2/67115905617.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/61565745371.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nuwigapuxe.pdfIn PDF document text
    • https://etimes.mn/uploads/files/43300090049.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160da34ca0598d---826566937.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/gokagebu.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bec796aae---gexumizowet.pdfIn PDF document text
    • http://geotersrl.it/file/62251624803.pdfIn PDF document text
    • https://aaaxxion.info/images/file/maxisu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a4537160b---gupogutoge.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/78351181862.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dke0iamdi0qdt05dpd90opt1jv/79694087941.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/55058838202.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ac5b66b793afe682b651729bd225d886/xorewoguwokisixo.pdfIn PDF document text
    • http://slsnn.ru/content/file/70797854824.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f2ceda9eb---gadiwuvotovewubimu.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/makamibozupalexeziwefipus.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/bepalativeloke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=%D0%BA%D0%B0%D0%BA+%D0%BE%D0%B1%D0%BD%D0%BE%D0%B2%D0%B8%D1%82%D1%8C+windows+7+%D0%B4%D0%BE+windows+10+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BEPDF 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_off0000dc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0E 21468 bytes
SHA-256: 640dc8de384c75e704ebd6676991817e1ef1cbeb2200d7478890d07c791f586d
font_01_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 11604 bytes
SHA-256: 8da84feeed7722ff6f495499739c684fe427dc4488d2c3a6eda53912a31eb385
font_02_sfnt_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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