Malicious PDF — malware analysis report

Static analysis result for SHA-256 3720e876db5e40eb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 00:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e5761f3d53e378fa322a215cac3bc5d SHA-1: b2fa648acb39c1fcd90e257952a1cdce2b71a6c7 SHA-256: 3720e876db5e40eb76cb7244b0c8c38ba18b42f5473a02136d0fbaf180c4919a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ms-krmelin.cz/app/webroot/files/files/sevusise.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc3ef9c4f6---76581749887.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/misezojejakunefenedoj.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae90d857231---33439962107.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/2381790829.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/rafafejoximixozurimap.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/6685091669.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6508284ce8aa9e515fc046b4085baf02/59716694060.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d326011c6---25519622404.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/rujarite.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/67266201244.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe871745b88---kulezubilogomix.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16118cafcce5f6---masigi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f90271fb---18963607426.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1636f8d89f---99789277938.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/dibufi.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/11967835915.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/kowunevexale.pdfIn PDF document text
    • http://langmypham.com/luutru/files/wisadi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c4974da8---jokaxasifuti.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/wonoxijisumugemuso.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/77058165298.pdfIn PDF document text
    • http://axwelindia.com/uploads/rusozukodumik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pervious+concrete+project+pdfPDF 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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 18220 bytes
SHA-256: 86593b29ee8fd7f9970fd88d6e3a8f68c27d9cf0071b73813f06f2f3057b3631
font_01_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 10700 bytes
SHA-256: 6e57bba5a25948227ac98f0961af9ca8c329bdeeab75e1eaae748ff060d2d111
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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