Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbca6764f736a517…

MALICIOUS

PDF

87.0 KB Created: 2021-08-30 19:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0b8332b8bfbd2d32d0da3e40e3684efe SHA-1: b52d2e623890510f1264d54698dd9abbe4d1ba21 SHA-256: bbca6764f736a517c2f3d1d5828f9f3bb9d174f4ba6601bff70dffec5567dc07
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=whom+should+you+see+at+the+bank+if+you+need+to+borrow+money+answers PDF link annotation
    • https://soft-print.pl/app/webroot/media/files/jilarutefosurizamegerodok.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/83107954626.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/34208244203.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/dikor.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/19cc04ab0733fa847a746616c9d172f8/nawusatovexubulolirogajez.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/49091135233.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/verilipulopeperazegara.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/fumunadaninijazogipew.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/66000228209.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16123fa68b9288---50615150649.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0cf1b4e4---81223446376.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/kejaxo.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7gigv2hmv1a51rp5v2f0kog1oj/42864232843.pdfIn PDF document text
    • http://intersonik.eu/upload/files/xavabarumijesep.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/majadazanederoxufakazo.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021082019202373499.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d8edde06---vidakubife.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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 17592 bytes
SHA-256: 2b3f6b550020f6b928219acb0b51cbbcf2a39e56e7fe186fbe09039b4c036261
font_01_sfnt_off00011aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 11144 bytes
SHA-256: 8433c13ca49def135f30363d5d2e8393e1f98255698032f2012ef779c43fe0a8
font_02_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1