Malicious PDF — malware analysis report

Static analysis result for SHA-256 6243c09bbe28da82…

MALICIOUS

PDF

68.4 KB Created: 2021-09-27 10:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2887407b7c55066acf843d7184660da0 SHA-1: 0f6dca0ccbb31ab5d3f553f53c17bb52ae2cb04b SHA-256: 6243c09bbe28da82d8bcb25caa72becd4191e75cd3ed6899f9dacb7c4dfea71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=dr+who+series+7 PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481a6cbc623---98175085192.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/89034928803.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/67301726820.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/36344389637.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/87479074985.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/63840129656.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/90763356596.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/sefose.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/xomatidurodumi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614177594372f---98904307295.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/81093825669.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/joduxexalemavobovakut.pdfIn PDF document text
    • http://skolky.info/foto/images/file/dukaduwijaguxaxew.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/tujojesidarimomujitetum.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/29153911970.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/32248938207.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fba54b111---kipopibumejotenod.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/litujejovumogaribosirav.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/35392071225.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/85107008.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8d1ac8fe---74486897366.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/jegatevejelel.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/39113599643.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/96553999364.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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 9932 bytes
SHA-256: 83a05292aa706cff2a4c1c7a84d6e5d79639b560bc3a45da684acbaac2f051d6
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 14360 bytes
SHA-256: 437bb8c222d7b86630c96cbde69ac25b8e781553cf56e8c27b169fc3b21597f9

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