Malicious PDF — malware analysis report

Static analysis result for SHA-256 778fe2e866027024…

MALICIOUS

PDF

80.6 KB Created: 2021-06-20 14:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c5f75f9e51b0e8fa4973dc9e9626ddc SHA-1: 0744c1148f63447fd90b1bcb34a1bda063f45681 SHA-256: 778fe2e8660270248935424be3987fdf0fd8ece0cc872835e4f7e322e064fb38
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, specifically leveraging WordPress plugin vulnerabilities for file hosting. The document body, though heavily obfuscated, suggests a lure related to a 'Superman game download apk', aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc373befe09---381175139.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87285e7d99---27574585628.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tpbrmmin08ds3va6l2egvalp25/6797644010.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fk7prb5c8s0i0n8i8stcn7vvd7/beralirexisidonedirej.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160812d698b496---76888512342.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7391a20a---desumatenomijukakakatavun.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3f3dc81e---tigarasejebevurevanodod.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160754122982d7---podarujabufuxev.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/81674143365.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/0mcrdjrmulslb8ui8i1v0ebmd9/61470973472.pdf
    • http://bmsorganica.com/userfiles/file/poneruzidupamavoselev.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081111b8e6f6---povonibotojifake.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2c99299d4858b3dd228ce0865470823a/fevomegavinenelajofajefe.pdf
    • http://laiyi-art.com/userfiles/file/kaxapanotamolelaterarajuz.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c376b306397---jejiseje.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79cc58297---watigajataxubawemakebofor.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/211702a549107cc89c38f581445f1afe/laxagiminazanipebiraku.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/tarojigidalejixilugab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=superman+game+download+apk
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb74.bin
3143ba3a9ff2f97b985d30b23dcbb02c8c9f4b4f671f2545e1cfbd05026c9de2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5360 bytes
font_01_sfnt_off00010da6.bin
8ec38e3ae4b89b931620b6873a9571e6403a501ec8fcd89aa2f16e3e7757d6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 11916 bytes