Malicious PDF — malware analysis report

Static analysis result for SHA-256 f549ce27565e6894…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 15:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29629fd8bae699173e253423eaa256f5 SHA-1: 0632bbf79fb62a43c7b4062272f374c0117975c1 SHA-256: f549ce27565e689452189157c2d8242bc692d7972a7ec0397387ee23a447a094
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to distribute phishing content or further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

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://pistant.ru/uplcv?utm_term=minecraft+1.17+launcher PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gt73trdd9vv7u1gid3hb5slrd3/68427277614.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767fb42001---pareputomomosarukizede.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/jogirubavax.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b16c1d7c---40639731031.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5b1e99212---14961208317.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/satedepur.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/13864545759.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/9277208559.pdfIn PDF document text
    • https://rajaunited.com/contents/files/30499692473.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/xavatelot.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/29348218465.pdfIn PDF document text
    • http://africareview.in/userfiles/file/kujolulejawikokumugubes.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de18ed5c5d---pipezijef.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/3580660349.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/88a7ded613e24b6ccd2ef72ff4b2123c/87774795420.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/38582610585.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/78117770479.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/gidoliwujidexuguzeran.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/6011332093.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903040509.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/84991412415.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6324bb6f4---57805896532.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/17p4qocmvic7thno8qptvv6c4s/lowulapejumobosobikug.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_off0000b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB177 16092 bytes
SHA-256: 21994e26bda91ae12ab2e05f8b93a617bf6e0c77083f3c830a94759ef55e84ec
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10404 bytes
SHA-256: 9790ce1ed9658b9e3ca4017c8c11fe10859959eee4209778ebab774a0e661217
font_02_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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