Malicious PDF — malware analysis report

Static analysis result for SHA-256 9214b83f347b99df…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 15:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbf6bef3bf4a59098f4d7f1d4b8e5a6b SHA-1: ba4f19129a912319f360aa54823da3a2f3e159da SHA-256: 9214b83f347b99df79bb3104e915d6a3c2d35cd102631ae7f7b8ea362cb0623c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The numerous URLs, many hosted on compromised CMS upload directories or disposable hosting, suggest a link farm designed to distribute malicious payloads or lead to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=antarctica+88+horror+game PDF link annotation
    • http://eternaseguros.net/files/files/57308308101.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/95229114427.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613767d6c73c3---nexubofegokidibuwodowal.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e7282e2f2---woxavewevi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161323078acfd1---kobug.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/87112470103.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xozirajiweburuxisovusolo.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/rojabiwapomoli.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/1192603379.pdfIn PDF document text
    • http://mobil-tech.com/files/66976251353.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/26001497472.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/xaduwivodup.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210910032457.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/98098175707.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210903205403.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/tesukuninidosipigewiname.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf134ff9d---45693114525.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/wukavurodekuludilaxefi.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/91701069193.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wixebeviv.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/perijemirelulugogolevomog.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/wozifowororodaru.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/69016152546.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/84313225454.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/70117237236.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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 10652 bytes
SHA-256: 83a245ff2919e7e3459e9f3aea098d6c76bcd16350abc4e0b9e7dfeeacd4284c
font_02_sfnt_off0000e6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BD 15832 bytes
SHA-256: e2d1a4ee214d011af9d20521ed797fb02a1524bca2d964eaef3d36f2262f8549

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