Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbe309708fd58ea…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 06:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f67451da7aa566bccec02f9df866ab7 SHA-1: 23056bf29015f049cd81c4c0cc5757fb9c073dca SHA-256: 6cbe309708fd58ea14b4d19cc2ec5a14f309c5bbc8d8163b03265f5ce729aee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=bacteria+that+causes+leptospirosis
    • https://lionkingbali.com/uploads/file/wibaturux.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/luvipimam.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77ca27aea5---damig.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e0479c94ec1---bolixakamamujulifelopud.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/255e91c0154240d9bf42a08c4c1b8e19/letuzevogejavopixowexom.pdf
    • https://peterdegendt.be/file/jasevugavulobuzawux.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2e0597b2---97334546693.pdf
    • https://summit-christian-academy.net/scauserfiles/files/veluvixugogobolanezigup.pdf
    • http://esistore.be/userfiles/file/lifakobodusovozox.pdf
    • http://lordbeaverbrook1973.com/clients/76835/File/xoputuwezume.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1f0fcd74cadec351c0ae960b0464d710/44806785225.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f06386e3c---wupezifi.pdf
    • http://benly-carson.com/product/files/36235170019.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078d68fd53fd---joferuzurezupekofeje.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b5cc452b---xexelu.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3875ded26b---75488735332.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021524202447121.pdf
    • http://lycee-elm.org/userfiles/file/nolofimuzifala.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/58d00c648431f02eabc89372b1366c46/jukinojamalej.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bvfv7cfsj0pnjnq09ima7u4e20/koxamigavowon.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ecd86be9---42144812151.pdf
    • http://www.aportecnica.com/imagenes/editor/file/sakadela.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bae30b76e---gunoximeri.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4a01c1277d1dcffb4f4d9212855a3456/fewetujigobured.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/kobomeralafojugo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 16792 bytes
font_01_sfnt_off000105a7.bin
1bf0ba1b63cc4f72deb4e3f93cc8579b4ae77b720bba10b7093c897942488349
pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 10520 bytes
font_02_sfnt_off00011dbb.bin
e96784c760b16e17bf64e7ea7994a79b2533396cbe81e60dd17df70dcf4cfe9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 16836 bytes