Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea3d9c182703a17…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 20:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f59f3957a076fed900993cee3e2d1d0 SHA-1: ea642db5bca6420cf127e1d1c6a73fc72888edac SHA-256: 6ea3d9c182703a1794b25305325062ebe34694d38ab53ba940fafabf98ab5fcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=5e+character+sheet+printer+friendly PDF link annotation
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/57191123701.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a31fd6775---80791542945.pdfIn PDF document text
    • http://egitara.com/upfiles/files/jisudubibapeganiv.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/rewupepituripugu.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/72680210084.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614071bdca237---24435786877.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/wemibisukix.pdfIn PDF document text
    • http://saktigroup.in/uploads/48343553519.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/87616008251.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/28663366038.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/zumaxobusuvusej.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/bevovazuxogeseraxobufi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9759905b---98614243840.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///pedinetixamewizitaboni.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/nuzipufijepazafesutu.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/kovugukezosafadajetojin.pdfIn PDF document text
    • https://mmtours.si/uploads/xosotekobe.pdfIn PDF document text
    • http://a899.net/userfiles/file/70776466042.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/91963557384.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/13815478144.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/soxesuxijuri.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161413dcc40ac9---8378429083.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/4481842379.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/32309619557.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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 17356 bytes
SHA-256: e1293bd4ce0fbef5426ce1616ea608e1914c0eac020e98ef7a815edaedce2c86
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E4 10748 bytes
SHA-256: 08293d1546e6b865015cdcfe3a8a8b0840aec8d04335530b35a62b00976b48cc

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