Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87c52ab7215c057…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 08:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20f5a6aa108bc0f2630fc269942f3931 SHA-1: 0c401893bdb7367d30bbb92d916775c1e24aed49 SHA-256: d87c52ab7215c05784a8589a31d01a8ca94319b0bdfb5b4e7580d2e8ef4fb141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators strongly suggests an attempt to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=vector+analysis+ghosh+and+chakraborty+pdf+download PDF link annotation
    • https://pasifikendustriyel.com/userfiles/file/lezowuj.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ae57fee2939---wabakuvovukofujiwamojop.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/rafipudapawawafezege.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/timubonadapala.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/65745321299.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/lewinonupexududu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f7b01c280---mugisusikomolisatol.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/aab5c58d6439a5a4a52f4b8293b54906/basazigewibajamo.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/91742514454.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/megubuwe.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/rugesibodemerekebon.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a0885fb2a123d548cdaf331fafcd5bc3/91446188000.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e786e002---35299189665.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91788d17d---12613215246.pdfIn PDF document text
    • https://guijek.com/userfiles/file/90373013182.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504125228241811192.pdfIn PDF document text
    • https://papiratisk.cz/soubory/medikelezirerivetelowa.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/fajazujodawozenedemu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28429425bd---wixabibobufiwedoje.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tamodupokaroriduziga.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/wiwenino.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lj8rd4husn907q3cn715vpqaac/35554757748.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/v50kdtc144c8ei1330vt25c171/jonajugofet.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c528b7eb963---mekofugisumaxejad.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_off0000bc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 16200 bytes
SHA-256: bcdcf1e0254a8ac86263c17649c2299cbfa1cf7f7bac9541922c67806e49bc16
font_01_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 11300 bytes
SHA-256: e048222a9edec8f469c3c10ac50309ee70212e6c3d99b27c586242f7c34cef8a

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