Malicious PDF — malware analysis report

Static analysis result for SHA-256 46555bcb633113c5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 22:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e4b51799f06993c06b78aef9dab4cc3 SHA-1: 424b82cb732c8c38c2e01db07b066ca33ae9ce92 SHA-256: 46555bcb633113c5845f223c79f040f1dfd2eecb61a79dd27ad773e1c8d1d05e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://casaatlantida.com/userfiles/file///26379677114.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2fb9cf592---31213915322.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/vupesu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161360f9bc0dca---zerenupinaxix.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/22934106967.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/retepupazadesupemeji.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/mefodek.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/50219548999.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/5436862591.pdfIn PDF document text
    • http://artospace.com/pics/file/dolefopabed.pdfIn PDF document text
    • https://cardolf.ro/files/53156045075.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6202b5ea1d7bec4752c6fe7fc03c8e5d/lazobopuba.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomexevesovikowarovezene.pdfIn PDF document text
    • http://ippon.lv/uploads/File/55581952745.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/jakot.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/66460080857.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jogowibigibejigit.pdfIn PDF document text
    • https://eetravel.net/file/gepukevuf.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/43458409905.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ed689b7dd201990d92b0a5251f5fee88/kotokunosubedusowilopu.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/jifigotape.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/55277214013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=add+progress+bar+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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 10544 bytes
SHA-256: 54bcf8b67eef28eba4ededa2bce6a2c5738c7ed7cfd68b6a3d7c744920cf1b2b
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16564 bytes
SHA-256: ef4d41ba2df0c4445f2f351870c700c0f29e2d28d6462ecfce4a7b4e42f78826
font_02_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1