Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5db0062665c461b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 00:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3897b1edfd92ecbc49d9c1ab9c212100 SHA-1: 4b0fbec1b6cd99b79767cdbc2c28a537e0e388d0 SHA-256: b5db0062665c461b357b4965b53eceb7e16cf7789808eef2df58686d16e9905d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate it's likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

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://studio5r.com/userfiles/files/53651105990.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ad21150---91803956099.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/68634135464.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/legubikefem.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6171c16e6---93983472972.pdfIn PDF document text
    • http://gangwontaxi.com/FileData/ckfinder/files/20210707_629722421E90AF73.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/50531541358.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/78075992261.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/26567750037.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/8638566396.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nudimaxemesupedu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71865a30c7---62560864280.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/jexixozesalo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076960323fb8---derobesum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094870f1d884---77433494174.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/tuwaxebusumom.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/98172466826.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3666b17b---15208270414.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/javezosaxabikawobike.pdfIn PDF document text
    • http://otczenacts.com/media/files/98812080761.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/wexetomakoweligisomikala.pdfIn PDF document text
    • http://01host.ru/userfiles/files/63635671704.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/goxodaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=syllabus+of+history+upsc+pdfPDF link annotation
    • 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_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 10912 bytes
SHA-256: 694804c1b333fa56aa93549a74ae8ed70af20bbfff1c3cac4a06cef9e41c470b

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