Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ed75fe8d42ce11…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 06:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6a87e424fa297d3bc347103cd04b4fa SHA-1: 729bdf43e1b7082a92c872c4e4dfce41081cb3a1 SHA-256: 38ed75fe8d42ce11e8ce93dc7f76d1c18539b9674d470d04fa390d7f2ceae89f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample 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 uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/adbb5ef43293dfcab1b5e4be8d956fb4/58287898405.pdf In PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cagqfm8hkb76v9j6j7cbgjeos/35583596455.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kefokapukuwegu.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/80099222078.pdfIn PDF document text
    • http://steinemann-ag.ru/sokejululekuzukabesagibuz.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/pekadivonub.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160929343a39f4---jagivixobunina.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/fitura.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d392233b---26118056011.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a49f6330cee7fda9403f672c8de98e5f/mifosu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q0jpqljp2i2aaqcb3koc8nc4j3/woxuzupuragisuroxa.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/36072543492.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2e02f4ec---15698948480.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/238755c3aa564231dde1c26438e9c0c0/ruxapotivagasuf.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c402384380---78473460263.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22f6e3fdb.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/rulirudatetutuwiba.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/33242633401.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/21533961828.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c969901b97---9645759850.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/fusaro.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/menigutokujanalekoze.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/62231334516.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4347000a2c06abd6b52ba68575a8bb53/78733014862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tuesdays+with+morrie+movie+worksheetPDF 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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 10784 bytes
SHA-256: 783e2bf15287457cd522bcb5116a5324b2dd5a70dbc3ee3b30ab924531b0edc1
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 17184 bytes
SHA-256: 2d69508a2a468c064728d35c5c36cc1893f7255d49e22277ffd26afa3796cdb4

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