Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f085af25708016…

MALICIOUS

PDF

100.0 KB Created: 2021-09-03 15:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb384dea30560b64efe0d8b470b3a8ab SHA-1: 08711440944434252136f9596962a80a11fb14da SHA-256: f4f085af25708016e3d4265a7e8011567c5515c78a4ac08dea277b3e1820c0af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 http://autoscuolapezzano.it/userfiles/files/56127927329.pdf In PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/99757073149.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/98294843448.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/zetadunepisutu.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_235824.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/64760703368.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i18e6ba6ej9lo1a5e2r1roe1fn/2323384184.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/92073d3f06b82812ad05d092b62d1e2f/21659445753.pdfIn PDF document text
    • https://irrisyst.eu/files/file/furezejatosukemux.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c10cb2c41f8---81653085743.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cb064aee---67488633468.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084f504ad573---nosefuvuxawa.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/82835252868.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c1edbce580836f19eecd719d843df908/44908565495.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adde3a073a2---25159823496.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/39599919032.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095c7c57c697---valunuzowiw.pdfIn PDF document text
    • http://bienbao.org/uploads/files/573265716.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/nuledowo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81335b1e97---nonoxarovasawiritonadu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bf845048c76c4a57bc1438ade877f802/kalowegigegaxuxatumifuk.pdfIn PDF document text
    • http://facades-et-traditions.com/actualites/file/xilagimixosenififofo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c211199828e4a7fa36eecb9a87b16fb3/12558106193.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/rusimolebifozerukutox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=combine+pdf+files+adobe+acrobatPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16228 bytes
SHA-256: 6d59ea6a2c2503b20eba28eedd5f6006d9cf05b22f5522dd9ea8a54092f6aecd
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 27236 bytes
SHA-256: 92b21e9f9be9ffd90d213263ce11477675269f193adbfb186eebbb5956d66650
font_02_sfnt_off0001477d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F94 10952 bytes
SHA-256: 049e46f35105e8dc2a3b2dcbbdae2f0d7b3e23dc55564c663927a103bc6e638b
font_04_sfnt_off000178b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B8 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

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