Malicious PDF — malware analysis report

Static analysis result for SHA-256 578d80fb5d69fd0d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 12:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7f097d85143e05002c30e42258a94e2a SHA-1: 1fcf66720ba04f3f92037f49f02e0f0058e3b9b4 SHA-256: 578d80fb5d69fd0d66d2e6db49fbcedaa8177d88afea97c6a351b65d0f01fef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple domains, including compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://linhkienhunganh.vn/luutru/files/dipuxirijewoxivadexute.pdf In PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/8498521920.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/59953536822.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/7814531370.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/36354368009.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/91913835691.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/vomol.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c14afa1cdd89f6aac2c5ad2090184adc/wigejobuxadunutoxovuloku.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/gejifagosonebiximusole.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/jaferizovuga.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/047a256ec0733e7e1ed02a5ef8129938/gosatasofekom.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/kuraxomibesu.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/42983667414.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/zarunokerosarodarepebepat.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/sataginowovorisiborogo.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/22643198335.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/15561882975.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/43514508418.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/82444256159.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/wararewakiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+app+cloning+appPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d655f14c84---82301202150.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vivigu.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 10504 bytes
SHA-256: 484fc93a9619bea783ed7dab55719b832d9def8f4cc9fd1f66045af6d420eeca
font_01_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 17764 bytes
SHA-256: be622c2b13c213d8ca7ef1db8b7ff609f198192061ce8bbad013e885c5da7796