Malicious PDF — malware analysis report

Static analysis result for SHA-256 986bb66eb15f82d6…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 12:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bef29725ff087ab90d43e57a98c4c703 SHA-1: c34f018408cad526d3f23feea81fcfd8f7e7b952 SHA-256: 986bb66eb15f82d6be8668948aac52a5aea2db205465b331fc49287c597ec480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress uploads or disposable hosting. The presence of embedded URLs and the ML classifier output strongly indicate a phishing or malware distribution attempt.

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9a252ed510f6db7ea7941c45c29c4465/94015316752.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/74usu8baqsstb9rlvip1qnkkks/35593817691.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/19156792170.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/38852047323.pdfIn PDF document text
    • http://ipublicity.cz/data/file/savozedotemeba.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/nuwegokabevoxez.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e03374536---31058400846.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/95839273759.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/79637028648.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776898b0cdd---23439572034.pdfIn PDF document text
    • http://turatabor.hu/media/41241129079.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915da3be2f0---52987933443.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/kijinejilarevefewemoximor.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/namisaripomap.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/489d53b9415b1aa08f4a66467c4af6fe/vazuzidarosojevokemo.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/kiwuperafaruwikuse.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/95092608554.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/wolelorineka.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xukibabivugedufoxa.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/kupip.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/zowebemutuwipukubawedagi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fcbbd163---favivez.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161255c41b3d09---delusa.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073af624dcc8---1075189575.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/pigumetorawavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=transition+words+for+compare+and+contrast+pdfPDF 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_off0000ed43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10784 bytes
SHA-256: 7366fa80181cc45b38017b6c95a8dbf447a9af75464e5fa222f735fe5127a309
font_02_sfnt_off00011e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 17820 bytes
SHA-256: e914883eca342b1e823554a7b18235f2c884fb950b27076873a984f0d7ffbd88