Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd6411876382db3…

MALICIOUS

PDF

92.3 KB Created: 2021-08-13 17:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10e7b5326062019fdb05dda25be3864e SHA-1: a3e83e1180c7b8e9a6e0f2d95a013717dc296a50 SHA-256: acd6411876382db3ad63d84cf1f6cfd4cbc3a988e095b93cdb6cac11f1abdf5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The file's structure and URL distribution align with a link farm designed for SEO manipulation and malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6eac389715ce0b52188f1c0d3166a057/redelo.pdf In PDF document text
    • http://bienbao.net/uploads/files/sopukiral.pdfIn PDF document text
    • http://geose.ru/userfiles/file/45642696697.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeaa689586---sexujazalofufesenez.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/24938454616.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/16220313019.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210508024225.pdfIn PDF document text
    • https://congchung7.com/upload/file/tavumunosawiwaxusexa.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c227b127cab---45371886364.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/tonud.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/zepasigomebatizefivitakon.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/zuxabibema.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/tikaxoradetosuvenujudija.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/guzoxufonib.pdfIn PDF document text
    • https://autoskola-scp.com/files/67209033452.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/a74e1a8efa3e7eb1bbb7eeaa59ded9b2/luxovurawifed.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/mudapesuzig.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbade7e4c4---64646189614.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/5bk4iu4k3lg4tqsbk20iqtonpp/52743391078.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/tolijamanibu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e596d0c2526fd86210dc284abae21879/15490139047.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2ssk041ksit16uqku1p6bsdfr1/mopodaninutuberakav.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/88155501968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=list+of+important+books+and+authors+2020+pdfPDF 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_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 18220 bytes
SHA-256: b67430907a999c18f882700b61d1909032aaa22ad9edfc946c27cefb7aed526a
font_01_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 11116 bytes
SHA-256: f9ef175f04016af281138485a9e8bdb74e8378e6cc92ae2d4b6a3f6d6820e82a
font_02_sfnt_off000149b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1