Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cd98523eb4dcc2…

MALICIOUS

PDF

78.1 KB Created: 2021-10-07 14:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f90e48019352488daa1b2b476faaf143 SHA-1: ef08689c542df8239c21b62de12afab01c0d2f94 SHA-256: b8cd98523eb4dcc20b1ec02b80166e5053b2ee729f0299634cac3a048bb53db8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links, many hosted on disposable domains or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

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://galerie-louise.be/userfiles/files/20478821332.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358eb7e3e7e---vawil.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/32783785152.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/repixi.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/zamog.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/rokewix.pdfIn PDF document text
    • http://boq.internet-match.com/upload/files/35608590431.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/31742822689.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/fifokesosaboxenikimabaf.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/76449256153.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/jabikefijuzulupeval.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/75528406481.pdfIn PDF document text
    • http://esangsok.com/upfile/files/77647178217.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tizora.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/60526168139.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161572dca3da5b---molefamixefuburepineso.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/46990785433.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/4509338856.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/bujonodojonixafivunedimi.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/61907744757.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/26082566505.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/66364831175.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/3693240207.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/161585069f29b9---bonijesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=business+at+the+speed+of+thoughtPDF 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_off0000e3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EC 19304 bytes
SHA-256: a0fd6870638213f719d075ea7f567311a2f4cef9f639e63f4ae50198b67f18b7
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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