Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f92ec94c05b150…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 12:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2f8d18912126960dd35ea29ab29992b SHA-1: 42bb343fe6d7bc76866be0cd40d01d30c9dbb685 SHA-256: 89f92ec94c05b150dd4bcf8cdf18a0d973bdf9d120b99f30d63ca8bccfe7dd5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136bd57a5e8e---49650545662.pdf In PDF document text
    • http://daisin1977.com/js/upload/files/18234843991.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/wuzoduli.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kejibegojevuritegekevep.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/bejuvasisoludoxexatima.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/56016429648.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/99920878484.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/39503809000.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/pupabujizukomukajabupo.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/nazefifudemu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24913355363.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/28558060975.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/78827815361.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/woveseritokikuxuwuvinuvus.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/fc8914973014c4e78eb3d0e7148192a7/9968894766.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/rivuwuluzifovemuzos.pdfIn PDF document text
    • http://makaroma.fr/upload/file/wejovevorevedow.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/83320446616.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/69548234725.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aabce96fa8---vobumo.pdfIn PDF document text
    • https://vpmemorial.net/images/file/94739195499.pdfIn PDF document text
    • https://oferta.lt/i/File/93842393975.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/34241502011.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b2eba395---88494304938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=brilliance+photo+editing+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10680 bytes
SHA-256: 002a4fcada684d1d615b76031cb0308de5eeb0f1ac647d05c95ae52f225dddcb
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 16968 bytes
SHA-256: 2d32ae9d77f5c4fcfbd0558cd4fbcc9821b08f26a27d7bd136357ea906514d39
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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