Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f824055dcd45502…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 02:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 325815665956a02744b4b6f95269d7f0 SHA-1: 46328bde389cdefa42487768765f26e7b7b92489 SHA-256: 1f824055dcd4550227ac2fa7bd08d9836ecb7632f1a202955a2f734939c7e190
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to numerous URLs, some hosted on compromised CMS upload directories. The primary goal appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7931

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.
  • 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
  • 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://encoyun.com/calisma2/files/uploads/megedanibozifuv.pdf In PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/napeborifolowafoteweva.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/bcbp7484lihn0dbd94g5jnb8so/mesunukafazavim.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/72582279721.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6cf927e326f2f53591d31e276a18d2ea/71651977696.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/21337619064.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/66786015432.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/lapugikilipeju.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/wujowukexejafonemabegibu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f03ad18d8b---12678650081.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210905003012.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83923056648.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/7800765466.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac6b7ca96---wezorumiruvaz.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/15843646239.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210903030050.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/28375560897.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/lukukixe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lcgkln8hteo76qvsh7h0gdrgrp/wukozowogabopikimufudaxap.pdfIn PDF document text
    • http://glassick.com/userfiles/file/25130120610.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131932a30b6c---8105731657.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/1544233956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=among+us+fake+game+onlinePDF 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_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 17732 bytes
SHA-256: 06d7969bf2bb8420101f75052cad18dd89e824d60ad97e62b5ce9d032dab8b7b
font_01_sfnt_off0001113f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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