Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65863c4a53fabbc…

MALICIOUS

PDF

74.2 KB Created: 2021-08-28 05:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a707b847d7943521486086d5c276d8bf SHA-1: bac31c8a7e37f17b482ce480efa4be474d40db40 SHA-256: e65863c4a53fabbccd438eb5abd73f1ddc1a13db31f6a5959b305eb76450deab
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 hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=bloodstained+curse+moon PDF link annotation
    • http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/ridenuwufuwenab.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cf58fe9a---vepafudolupi.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/folinolexokinije.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9072e3a966---medakozevamezamaje.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/zegiwidupokuxapupe.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/94529070692.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/xazeb.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/xuxoduzudagezijuxuj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ebc5b07d9---lanisobaxekaselugobubuv.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q2fe50qtnpnl9bviajq9erql1t/82483341483.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/xadovodutedeb.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b86beadaae0---89070967442.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/edc072f7ad7905ff916ce62ff5a25a07/wejujarosetesugekinomuxex.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec3e8f452---wodaduzukozivotabezajo.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/ligefitibun.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/64699750612.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/pevoxejebaviruluzexowe.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01cde3f405---zilevikovafekejukojoper.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/bojagede.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931e71635cb---vupinenabiwiribin.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/zuvul.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9b0a01bb3fd12b8bb38e5d4b553fc4e0/79596261859.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/jinapibixizivetored.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/76194793692.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/lisib.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/50649417449.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/72888931782.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_off0000bf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 10684 bytes
SHA-256: 259b6ad383f54bd859bceefcc5ce8f2fe88de85b93d7aa32aefe65f0cbe4b463
font_01_sfnt_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16672 bytes
SHA-256: 335a14b23674391f58e2dc186cde23fa4089a11b1e07acfd39b74f3085511a52