Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d81705345544fd…

MALICIOUS

PDF

73.4 KB Created: 2021-10-01 19:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 851d92f085a9396822f5d102a220baee SHA-1: 9366fc8db312dedcbdb67fab01961248b7edeeb6 SHA-256: 92d81705345544fd502ff1d6b2414dea23a8772095ec5c38ea38524b6f755e61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with high confidence.

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 https://smidgel.ru/uplcv?utm_term=microsoft+excel+2019+vba+and+macros+pdf PDF link annotation
    • https://propactionvehiclesuk.tv/userfiles/files/60849407979.pdfIn PDF document text
    • https://iword.de/userfiles/file/87929594041.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/22237087872.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/lunumixabadirokalaxesoju.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/96957212290.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/gifusowupisozulupibim.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f53e434c77---6304107500.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/86438361031.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/df8a8e77fb47d1f30d46a655c6004e83/49686224719.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/32939515529.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/81193953894.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/rubiletosonemereriset.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/77767958249.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/15878233981.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/4056413032.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/55430228739.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/roredumowivo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa1d8524f---14388680443.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9aed0f18afe0516c5f6b9d852cff2ad4/luxaxusurigan.pdfIn PDF document text
    • https://tessuno.com/upload/files/613ebcd1d7263.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/thbcpsmmjl8mduj91iadedf04p7k2la6/13245784031.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dudififakavivaxoligosesu.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_off0000b52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52B 11544 bytes
SHA-256: 84e3642e328296ce0765b87af22069750b6b058ad60edb8e89de24bc8145c3a7
font_01_sfnt_off0000d072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD072 18440 bytes
SHA-256: 82400b8d9d42b9fa3ccfdbf9416a356947e9b4262de8abac1083c492065a09dc
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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