Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebeb1c8cd65c0e64…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 09:04:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fa455d9b58a076a61011149b8279d7a SHA-1: 0c59ed4005fe58729eae6eb8378150ea32e04224 SHA-256: ebeb1c8cd65c0e648630aec92381aaec1804c7e5d42dab12def31c558a10e513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://plasy.com/uploads/file/64907428221.pdf In PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/nireja.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/rutotatosumibepir.pdfIn PDF document text
    • http://getem.eu/files/file/senuzoxanosovekapolem.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/21862681955.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/72872621554.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/pakewo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u7d8mebl5fpr4714jroe0ao1c7/lusifejunomubaludim.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910114957.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/96087118732.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d0732555d73496ed0a73d2d3eabf68cb/jofiforetimoru.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/84978616926.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xuvexezodutozubopusum.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613468027a0f4---12292477895.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/60845461626.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/42806096657.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/xudikavurosoxiji.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fepejalukikokofi.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/14558012133.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2c0c08e2402532ad6c7c4e24c38930e7/22846662969.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/29771275980.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/ruxomopi.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/batijivovofemasunixida.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/85282723565.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/11900429088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=god+of+war+ghost+of+sparta+coolromPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 16408 bytes
SHA-256: 8231c5b82041e6c99c4366629805d1e503acb404b0c49e86f18ef7579b1ffcbe
font_02_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 10864 bytes
SHA-256: 799c339f25e9ad9cc0d31656368bb4a825e2ef4e41008df1e5d8d19e4579f3e4