Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fbb3ed658e32a7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-17 08:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 178acf662b4aa25260bd308cd0005716 SHA-1: c3b7470819ad232082d7ef7b5ea7213bb1be85d0 SHA-256: 73fbb3ed658e32a7ec3075e46126ba25c00ac783df67c1679126edce480858e6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external PDF files hosted on various domains, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137435bacb8e---20915875478.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/17310413893.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/3295555836.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/67897723858.pdfIn PDF document text
    • https://campermagazine.tv/public/file/vozetapixubo.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nikerojubavoj.pdfIn PDF document text
    • http://master-br.ru/img/file/25346269108.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/divolozexaguxazafe.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/46168736833.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/simadadafaxaparuvo.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/wafuxif.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/11165450645.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/duwowegit.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jifarojorojoxovamoxu.pdfIn PDF document text
    • https://tckontrola.hr/files/10524650744.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/xufodeduxonufosol.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/povasisuwerabava.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/3104202957.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/vuwadagazarukikusararovux.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/81abfda5ec2e45fc70abadb3b595ccc0/vunegukomudumefadowa.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f857488cdb---xijimididurijuzupeli.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/816539291.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/sonewutufum.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/popojojawimutu.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090504331670554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+android+apps+for+hacking+wifi+passwordPDF 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_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 17380 bytes
SHA-256: 95d9dbcbeae5cc4762b398ae00151abcdd633527578a96733b530e61d5c99748

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