Malicious PDF — malware analysis report

Static analysis result for SHA-256 6143d39aae8bc939…

MALICIOUS

PDF

164.3 KB Created: 2021-08-12 20:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f685e8ffa5c85154e4f348d88840d5e3 SHA-1: 031db87f075a27aac191a57bcf9873b2b1077ad2 SHA-256: 6143d39aae8bc939bb5c53bb99a10a7aab3b953a9c912d70027620aa54db13f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of numerous external URIs and the structure of the PDF suggest it's designed to redirect users to these compromised sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9693

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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e553ab162f---kakomemudexotapuvosag.pdf In PDF document text
    • https://wic-net.com/userfiles/file/50975107846.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c320b4b925b---9318184670.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/de8a6df0ddcbb0546c2c44e359113083/87019412989.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/64699139969.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/60536872801.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608907459d16a---kawisezawunijizupuge.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ecd91b624da407f3cd2cb2dfe392ccb3/61087066591.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39bb80c5c0---sirejugidal.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/9759546611.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/todal.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/68464857588.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1171fe769e5029606e0848c17aaf0a2b/sisiru.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2071f0f9---waxodexukowonalod.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a905ced1f---92654245127.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f08d3e381ac---57679857017.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/vozimizoma.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/jemerujoti.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/kuwobatowagurekexukupewiw.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/70488260540.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096ce457077f---74145564148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=public+finance+rosen+pdf+downloadPDF link annotation
    • https://lapdonline.org/file/80870131856.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_off00021f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F58 10844 bytes
SHA-256: 094baaa64b8289af8345d12e6c3adbeb6dfea70522717c8273e1785301045d1b
font_01_sfnt_off0002384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2384B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002505d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2505D 18796 bytes
SHA-256: 58bd9bbf7e79dbcd2ee99c9b93281d9396d4790baefcbf2c8abdccb7f824ba86

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