Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cfe8381264b243…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 05:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26f3b162a3393f65533aaf213e1e6623 SHA-1: ac4e7bba1a88622e5085538ac869025d1ed54d8b SHA-256: e5cfe8381264b243cd395688d85e8dde11bef96c8aa54318e108928ab7bb4e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is part of a phishing or malware distribution campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=spartacus+full+movie+download+utorrent PDF link annotation
    • https://anandamsanyal.com/userfiles/file/vedorusu.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/62453842171.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/jifelumexijogarejibolosug.pdfIn PDF document text
    • http://kids-ex.com/images/blog/file/basejatutediforetus.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/40638291378.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/52501493799.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc95f450e0---fozejep.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/bomofezuzujagilapuluf.pdfIn PDF document text
    • http://intertribo.sk/files/jakifuvemezaridijuvidagup.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/jorevokilonasunaxuw.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/duvirikixivegubonasedateb.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ucelevvoqn6pgi5oaqcf0kn4n0/93015519968.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/25919252736.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tolugevowijewijaligesaze.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/kapazad.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/ziwenisodapufixomatotagor.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/f4f8ea4dc79375a863f6010313cd2ab0/71021771498.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedec3d629---88650567516.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/99733489638.pdfIn PDF document text
    • http://lukinserv.hu/file/politawamujaxawokeluvu.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/mexiluwu.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/rusunalojumonojasaza.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/giwezunefi.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_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 16728 bytes
SHA-256: 836480afc07cdfd0949dda7ccc16040dfe2e285695f2d42baa8a39c4586cae97
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 11108 bytes
SHA-256: b93a5a4dd3506fa0a4bfe954e5972d7ebf69356391b43c5a56c4c6bdc3124a97

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