Malicious PDF — malware analysis report

Static analysis result for SHA-256 529638c46ed9d8fc…

MALICIOUS

PDF

77.6 KB Created: 2021-10-22 22:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a6e491a4072d7a74a05d0be1493eb3ba SHA-1: a961f85d1025c6b10265bae231dfa341f37b06dc SHA-256: 529638c46ed9d8fc4faed1e0edb0ae8e4e5f4f451807c618ae00e41f4b7e91d6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a malicious PDF used to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=class+9+history+notes+french+revolution PDF link annotation
    • http://mmdplus.com/userfiles/files/20210908_194422.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/34748736292.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/womapulora.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/878feb68e1ad56c891aa49856d5fef12/leremux.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/95899084096.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167b90f9c298---kowofepuluzav.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16169e0b3110ca---sazake.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210916033804.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/tuzidupupuluxolosukij.pdfIn PDF document text
    • http://jn-zhsc.com/upload/78299894710.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/pekanagiku.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/wosegup.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/xepigogawelixejede.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/37087396602.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/67902463333.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/jarezevexevafubukew.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/nuluzimopojabanixem.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615a87c920b22---92148657596.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/mizodepotipebazumutug.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156ffa270224---runolewelamir.pdfIn PDF document text
    • https://festacontinua.it/public/file/kexatigupetobalotosu.pdfIn PDF document text
    • http://homeopathyhk.com/files/napigezoxixolojinumowuxe.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE8 19044 bytes
SHA-256: b7f9c33e8bcbfd59b3792ec47fb1732bd48d1b641224a63e4ed1c1eac69c3660

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