Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d4654ebc14e9a6…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 13:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbc3674627cf97e5a75beb23ad6986bb SHA-1: b48fe3e734f5fd87540005e09352689dce9c192f SHA-256: f5d4654ebc14e9a61826c51897a16b3fb365dd7fc7def8acf477d526aff34755
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://olympiad-bigben.ru/ckfinder/userfiles/files/fokepezup.pdf In PDF document text
    • https://firstview.christoff-design.com/files/buragito.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/68861050211.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/6382482125.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/busosowaxoxamenure.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/28552415894.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/80289193165.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/20864587162.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/16495635863.pdfIn PDF document text
    • https://wecareprogram.org/images/file/tomabemokutalewira.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/fuzeremakoxa.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/74562083372.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/mobejo.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/12768683878.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/73942699863.pdfIn PDF document text
    • http://sql110.com/pic/65199357215.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kanomekojujeselu.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/44703342267.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161310b24efe72---zegunitemodasadapevut.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613135fdd132b---81948510004.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/54625517249.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/42521387356.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613368c772069---nodus.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/kuwapabafeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thop+tv+40+apkPDF 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_off0000c6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DB 17520 bytes
SHA-256: e7dd6a101d2e0f35c2e3592083c257135b537da44e0d176a739927c23b0610ae
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 10028 bytes
SHA-256: 94c28daf07f91c39fea5607c8051d7d277b02b40772729fddcc7333eeb37329f