Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56ea0f19c7cb89f…

MALICIOUS

PDF

86.0 KB Created: 2021-07-30 09:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c7c29cd0455fc9411b439b1696231804 SHA-1: 6062705e27a8a82830a648023793464c9c9a2318 SHA-256: c56ea0f19c7cb89fe8eea1ef2548220f70a3744a826cefaa786ba12d750cc425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or phishing content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://drafthe.ru/uplcv?utm_term=how+to+connect+jbl+soundbar+via+bluetooth PDF link annotation
    • http://greenplanetnepal.com/userfiles/file/waxegisimozuvejolusok.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607432ca29d84---pufanisuj.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/nuriwenivomavurujopavebil.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/32980275925.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f3d15678f94ff34a5393a2c5a2a4a2d6/90661214124.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6a10e7e80---duwiwogawivunewofonomi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/94113280509.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2645ead4---mogeroke.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dd075b984819a21c8cd4acec5c4c2dd8/97771962647.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/81709412776.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078da00ae5d1---banosinagorosopivovu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/c00br0rfae70ufm1j87gnim5h6/wosanugavojofogodabugaxe.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/o6odc8e7kf1lgm5agu51vv7b1v/mixofunivoga.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/nojiw.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/jusipomatebejamopulirosig.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/fegubixotakijade.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/bitomojepalanofatuveba.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abdc36e52---risepefazovuza.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/32354536672.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2da8d723---wafalodovovawifixojuzo.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a421f995241---19095195802.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/7277f4cca86878b1ac663690ec97f33f/mivapebexavuvadetofewatos.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/50754418817.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711f7df2e0a---nofunagogunogedeveneluw.pdfIn PDF document text
    • 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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 10980 bytes
SHA-256: bb1906da0c790fcf139243b007348fb331a60adf5782b2b8b804e011e7390abf
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 17252 bytes
SHA-256: 0a0f3b005ccfda120cf9a4085dfe43528802bca3ff130f36bfcf5e7ae3eba618

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