Malicious PDF — malware analysis report

Static analysis result for SHA-256 c906f50f65d21f44…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 21:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b88dd225c85ba131be4e06c4a6556f7 SHA-1: ca9a66b3071374a4f04cd28e82773abcf296883f SHA-256: c906f50f65d21f444d776d992600548be84ed095fc3f20cf80808e8e64d391c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that the document is designed as a link farm, pointing to numerous disposable or compromised domains. These findings, combined with the ML classifier and ClamAV detection, strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/melexukuxulowidevikenav.pdf In PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/davunuwej.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/kuxuruvawi.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9f5h3v1b2gqsba92hqri5f1b2g/25733958045.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/kidufutedavifobefuremuk.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f896a1b73d---kiraxuzobep.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/6593287661.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/63807007991.pdfIn PDF document text
    • http://acril.ru/ufiles/files/rimatofagajeki.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/dabukabapuzu.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/gizeromo.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/mapikusewoxasazipisi.pdfIn PDF document text
    • https://pellevah.com/upload/files/89203913616.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dcs0dqin9bnsc4q04copebfd9s/larexarel.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/gevasafejazapubixok.pdfIn PDF document text
    • https://peterdegendt.be/file/fiwebetuseju.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/bodudodowotokosopekunes.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/f31f7924c6f65d6ee2bb704ee48f879e/luzijosodeb.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/54591601750.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dunegozoke.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/dokoxelaverup.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/68728227225.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/judijux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+enable+background+app+refresh+in+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_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 11308 bytes
SHA-256: ea331d6d745504fce8b34f85e71b741f589d25a78d763aaff81e524d34fb960f
font_01_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 17316 bytes
SHA-256: 5927120b5f33b49a6a6449e6f4ef808d26e2440e6315480c1cd673cf0ef12179

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