Malicious PDF — malware analysis report

Static analysis result for SHA-256 106645776d2ca27e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 07:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a21cff302d56bf118e62da171b3655e4 SHA-1: 84ffeda76da50aa2066d14d203931e7cc5168fda SHA-256: 106645776d2ca27e39d4f574d51fd0ff1be0536c9b1a3db18eea8f38c5364701
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these external sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://oniceh.ru/uplcv?utm_term=bellefonte+subdivision+camarin+caloocan+zip+code PDF link annotation
    • https://medgal.pl/admin/ckfinder/userfiles/files/xosavuxegoze.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/bimerudoxifesusopolemonuj.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/duwejilenolirekinadolosi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395df8d8812---zisezi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g8rcmpvvkifprm4hbtj8h8kq87/91071699728.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/78679441496.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/dinedebeze.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/66329789944.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/56092321323.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/ridexijurowo.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/vozuziz.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/74334603239.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/tojuxibitafenosaninesi.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/87975765534.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/vejoredubebevemalan.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/73453669331.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/90334118509.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/32669466062.pdfIn PDF document text
    • https://etadelloro.it/images/file/19289706823.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613320d2e956e---85056482090.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/degoj.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8bf7266e---38783244663.pdfIn PDF document text
    • https://tele-video.ru/upload/files/10360963254.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/risadenuzipevetutimusoxu.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_off0000c768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 11200 bytes
SHA-256: 75fdf1a72cd1b0a197f61e5dad80e108ea8c4164b19f27ed6df31316d5ae95ba
font_02_sfnt_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 18172 bytes
SHA-256: 576699a11c6fa76d77a4a2ed33b894d02bbbc4d5739875c538940d793e2bf7d7

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