Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad9146238bea77a…

MALICIOUS

PDF

62.1 KB Created: 2021-09-21 20:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1446538c4a0690f7abfb6c0f275be17 SHA-1: e3ecd86d74a83b8ebe890f070e0df6448c111e5d SHA-256: 0ad9146238bea77af5ff13a8a82984d742e98520b83c3c646f9ef6f3a9ef8559
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6561

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 http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8b0s98oph703du793aek88q6j5/7889434349.pdf In PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb48c401f---kadarojetaredakupex.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/57589208144.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55402178891.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/56758384792.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/pumezenozusoka.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/gubedubiviwejivapej.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/vedim.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/beteguran.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/vopasixijurufizun.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/sinudijan.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/latizoxuwixik.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/mesetes.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/54328186265.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/fepekusiloraduzil.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/75560084142.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/83365266502.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/gaval.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144837574058---69365092464.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/nawedilemomadigataza.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/gadupufapina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+premium+games+free+downloadPDF 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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 15132 bytes
SHA-256: 51df4601fb4c7e274d53c3e95b3e0472dd28b95f7441b2fda4c7440754a81264
font_01_sfnt_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10912 bytes
SHA-256: c4e948ad38cc3b2ab7cfb2f8c9c6fa86686d8bd2f41be04a82e3ba0c79139b12

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