Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b10da6abbf2fbf…

MALICIOUS

PDF

63.7 KB Created: 2021-10-08 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5732d42a4836909b4c07be46c40c1dd3 SHA-1: 7e78920d8f83926dcf171b2f650f0580fe28ceb6 SHA-256: d1b10da6abbf2fbfc5b22c8d87ac1d5f4fd5d6381798911608d55de2f21e732d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the presence of link farms pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9575

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://rubin2000-distribuitorshop.ro/userfiles/file/topiwavoku.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/tidupekalasipopoxenab.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/88473767883.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/19636526582.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/90173168651.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/76224002870.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hgmifhjul8aj3nm172fiuct733/84974301293.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614477ad72c80---21782696802.pdfIn PDF document text
    • http://koutingchina.com/upload/files/nofobevakemokilapotixasa.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/9538686882.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/86708504462.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/poluluvivemaselofuzagubi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161586ab33e868---magugipasuwo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/paninu.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/vofebiga.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/bapudazet.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/24101202291.pdfIn PDF document text
    • http://4yoga.by/pics/files/2187768750.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/lubobozogimivunipu.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/46731738533.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161600376ca67f---jejexavevem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=2005+ford+mustang+gt+deluxe+coupePDF 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_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 17272 bytes
SHA-256: 2752456e38bae8a4b7df4f508b7f258ea20896d9aebf0b7b5185d47c005d49d8

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