Malicious PDF — malware analysis report

Static analysis result for SHA-256 59c9d610b2a72e5c…

MALICIOUS

PDF

591.2 KB Created: 2021-07-30 13:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7fd5748ed342578365fb3330aef25297 SHA-1: 8f94b7d259fcef2ebb6cd2b680f3f288d483a10e SHA-256: 59c9d610b2a72e5c5ca3a5a2a550e766167bbe5bf89bf554c02e172d0c8ccfd8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several URLs point to compromised WordPress upload directories, suggesting a pattern of hosting malicious content on these compromised sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a phishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7096

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://nestsearch.in/admin/uploads/file/bekedejomobanoduxezo.pdf In PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/83251632817.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/10741515057.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dfaf62d151c4edd586e545732547b36a/dikovelibupi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/74d021dbb85b1c1b473b50384000de30/tejobajivutajo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/75783769694.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/rakeva.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7cc3ce58---34326832776.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/24058076121.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/sewagitalewasora.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mofogunadameta.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3895691---dapukofikogiwosopedebob.pdfIn PDF document text
    • https://ttnthailand.com/upload/userfile/files/limen.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078acd000159---87188330886.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/pujetuguvaf.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609253a4430bc---44397949737.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/mibijiwufiged.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wunavosovogo.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g04u457etkvghfh74eumlm78q1/gesinawegululemi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beafbaf1412---1592326218.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/poxexomemitenupop.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/invnrnitqnpg1b0m5g70dom190/foxijakakidokirutilemesat.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5f086359---63595999325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=remote+neural+monitoring+lawsuitPDF 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_off0008cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0008e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3F5 10684 bytes
SHA-256: e9dab0563530576ee79409cdd7b0c1d06e30678ea123fbed2528c92b5ca080be
font_02_sfnt_off0008fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC88 18164 bytes
SHA-256: 5e3af443c18f4885ff600a3f83aa71f08294538efcdbdc40fce9345ed503821c