Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6554853752d66ca…

MALICIOUS

PDF

67.9 KB Created: 2021-09-07 21:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c33e4f6248cc20c6ef5ecc0403de0a8a SHA-1: edd61d524514846c258b19221562e6dd6a06b208 SHA-256: c6554853752d66ca92c29d7391da1b2e6c3e6419af161d41fc96ad0d95aa349e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6306

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 http://porpora.info/imagenes/imagenes_contenidos///gaferedexi.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/49565469874.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/tofipuwixuw.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608068769e5cb---ponizo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096190faae9d---dopex.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157f575406f---53480944043.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/21891919898.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/salokopinorujo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ff3789683c8bc3502e5d16fe4b87387e/9791141876.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/gikilomavagosagaxavo.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/68998723734.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608364e6d4366---pumepusoxukebugo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e0489998---pezojowaka.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/98035157054.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/xekuxajoragufetazipubi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3935a942---padonajelidareperi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f0befad1a83---82612695690.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/33602230541.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1a479a45---bonefuxuxu.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210701214142.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/48957218125.pdfIn PDF document text
    • http://asfalon.com/__files/file/46880144054.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/50645802723.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/35409814950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=compile+tex+to+pdf+pythonPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10580 bytes
SHA-256: a6da83af85b25d6bb19135871290a144e3fcbf042cbe7dbedd07ba40ce2e471f
font_01_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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