Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e07955c1291bf77…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 21:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 436710c4082018c9c38d19dfd6d40e7f SHA-1: 3507242b0fd1d7e1fc18ce52b7e557a53a8df494 SHA-256: 7e07955c1291bf7798c7623a13eea0dc9acff4218f2bac74c92ea993bdcb9b54
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/c872110ec729e0871e7fac0ba7c067c1/sisomikoradofunomow.pdf In PDF document text
    • https://bd-sokolovska.eu/userfiles/file/33690665529.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cd70f89d359a632d4c5ffacd60bb8e65/sonilutagejopibito.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/pakusagigewoto.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/sejena.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5na883vb28dcisd201oje0rqc6/47168114096.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5995e80f2c1f6e18217aef9736297b7f/vigexodupag.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/lojuvilupeduw.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/58388691912.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/31325021558.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af885f0c4e0---titid.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69480180625.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f43d80c37---wigevates.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc020252d---41628957816.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/rojosigisimeneridode.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/92836764572.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/6v7blkli6kgcrp6bmodhcod4bt/9377724141.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/81962022036.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89a3eae10---xuxeso.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/s7pr0pkmjdst574m0j9rcbsa61/23334090180.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/70331215963.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/wodudajaxerapiduj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25ff213fb6---magidigiwamifora.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/dakuzelomebefizokezemoz.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103403d7bb27---jasadamafexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=herramientas+manuales+y+electricas+de+mecanica+automotrizPDF 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_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 10796 bytes
SHA-256: 2d4ac15dfa888a3f7195744c08dd80948cd0c8832dfd9aa9b178b860f35a1e31
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 18800 bytes
SHA-256: fe1183ca8c064a48975a51539a6b1858f55e6973c44bf1789ef21ffc3019c334
font_02_sfnt_off00014317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1