Malicious PDF — malware analysis report

Static analysis result for SHA-256 b162efe3779b1105…

MALICIOUS

PDF

95.6 KB Created: 2021-08-01 09:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4e31500eb84e846d9d3750301ea026c7 SHA-1: 354666c9fab2001217b138ec141365f3038d13dd SHA-256: b162efe3779b1105b74088768a165dfed511567f6f14aaed11e9a0809ac7f66c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which form a link farm designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://oniceh.ru/uplcv?utm_term=descargar+halo+combat+evolved+para+pc+en+espa%C3%B1ol+completo+utorrent PDF link annotation
    • https://tonwen.org/userfiles/file/65650058550.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73a9ac352---72283957509.pdfIn PDF document text
    • https://avenue102.com/uploads/file/lorosaxuserubefumaj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/tamb0h0rorvoeo4b76vvg6r4c8/67576021114.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b904fbc069fc64d795d1dcaf41e38a55/82611235212.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/599601bca18edd5627961b7d9435160d/risinakuwobukoviki.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096af7925f7d---98245672389.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/21650921ecbd90ed32dc7a1a3757ba2d/movinoxov.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/19765953246.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210623013122421.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/xofupalur.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095d554352c6---7849164749.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f5fcae51008324d5afeeefbe708fa3a6/xojozuvotiw.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p3kphklu3kjp7uvpal1fjbutb2/98078575464.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c61455a58---17370505290.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4b0hqa7spugmp9cdd0v693o8f3/bobapojerajidufesuw.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/78791976217.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegisagovukelanimo.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/motudomil.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/jipewujakugekafubazot.pdfIn PDF document text
    • https://goldenapp.net/file/66332376654.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/7f4de5aaa2dddec318ec06558256cca1/wamiwibiminalixejisaxad.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_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 17700 bytes
SHA-256: c6df8b1fda3a63e7bebb05d3392816f4e1b19c380ca12e6317548a59bdd3d8b3
font_01_sfnt_off00013ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 11380 bytes
SHA-256: 7216996c4d6ddd87431e8c707449020fc139c79a018aebf6c5659f81d4939780
font_02_sfnt_off000154c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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