Malicious PDF — malware analysis report

Static analysis result for SHA-256 869eae65fcdbdbb7…

MALICIOUS

PDF

78.6 KB Created: 2021-09-15 13:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4ecf1743c01908a01481463be601d99 SHA-1: 33dec50528637775487055b9d9c2dcb24f8a4438 SHA-256: 869eae65fcdbdbb710286326104b572c67ff6db628d7c00ce52c2cb65ae2a1c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://krisoc.ru/uplcv?utm_term=tom+and+jerry+movie+fast+and+furry+full+movie PDF link annotation
    • https://eklyps.net/images/file/80721428026.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/vaxubiren.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/67272941281.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20728648442.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/27777686338.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/87429910538.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/xobenimonuzunuxagoz.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/burubiwidunufusija.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/budogizigufubaketon.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/56299c885411d16d44206ff867dfb3d8/25140412258.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/77451171297.pdfIn PDF document text
    • http://esejsc.com/upload/files/35658846587.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/98256369431.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/87238097909.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/34928644236.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d06f5359a9---76850153308.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/31866574305.pdfIn PDF document text
    • https://cet.sk/res/file/99694548667.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/foxuxizag.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144afc7d61---15709528728.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f49ab2fd---xapujemuzibev.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/zamuvusudemanix.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/34839611807.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/xapinajudolakatadisap.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fafin.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_off0000cf42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF42 17272 bytes
SHA-256: d2128ebb740949b2c4036b93c1fbabd563e67900230e3c2c10ed9902b9c4e5ff
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10888 bytes
SHA-256: 408aa61c9bbea36bc0e4445100a88dc11dcd336e914d6cf1350d2880d7b29898
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1