Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e9d1f85144ffea…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 21:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c895a396f25f43c60cd8627754822ee6 SHA-1: 672e298a541c5cebcc59fab180fb23466e7c9c17 SHA-256: 86e9d1f85144ffea96a6d88dd610536c9d2335148074bbbc8eeafd31037b5c3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites or disposable hosting. These links likely serve as a link farm to redirect users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://infrive.ru/uplcv?utm_term=pokemon+fire+red+rom+mac PDF link annotation
    • https://interativacorretora.com/fotosempresa/files/70419559548.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/dakaganuzewikedim.pdfIn PDF document text
    • http://rayer.cn/d/files/rovexukipejefunu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18120d85e---59601246241.pdfIn PDF document text
    • http://vo23.ru/upload/file/36797013545.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/197797253613f95881e082.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/92f2642263451f8bbb4f9e1621ff2254/kibilidir.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bm3jtai7g8jpv1lkprdddjvmf9/7195215075.pdfIn PDF document text
    • https://kaparatt.com/images/File/78355950579.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331e0ba4787---84822622759.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/92db7e368bb0c5fd2225410dd902d859/mezujabavusivudefobe.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/70117441260.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25202928371.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161391dad33060---xewemef.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/xozunimonefegosokisebem.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tutoxolakit.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090207261786.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/pinogomugelalebum.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/64770558372.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/gofupu.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/64298243085.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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 10420 bytes
SHA-256: c41284eb66492aad01943bfd903c9128f4d35a40be1d2bc9fb67e11ee71866ac
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 18840 bytes
SHA-256: c642f73a15eebcf9e517adc789eec6b74da763ac2c32eac6c3059cb134095d13

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