Malicious PDF — malware analysis report

Static analysis result for SHA-256 404da00e3d2c34c8…

MALICIOUS

PDF

70.5 KB Created: 2021-06-04 19:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91319b3edbe364219980d19cd1739e96 SHA-1: c524887022e932156203b6a7a4628a1c05ccd390 SHA-256: 404da00e3d2c34c8687e4749569facdf685f19922f099327b1271921c3d54784
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of external URIs and link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=pixel+dungeon+en+espa%25C3%25B1ol+apk+download PDF link annotation
    • https://bbpartner.cz/userfiles/file/15143408978.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/83fdca44e903a06b600b68c0535291cb/44490524003.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/jaft5ttv6gaakvibg3onhvu7u7/kelipiwevamosol.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vsh48lrk4j0mq6abm05m1lrsjc/91240696155.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/fajuderixopajenovaxepuf.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sexuvirudawete.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlluip77e40ddcnpg0b8nooe30/tanamotanasixiva.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098b66b102d4---kefifubijagejisajedov.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/205075a58ee98ce74d8f8905ef31044e/4915081474.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sevaxu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5dc37fe4---zuzokexalosadinolan.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2157dbafc5af761c9c32c0c3308f36fd/fulegatesavepeg.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11558951d---panezujeratabofivesavabo.pdfIn PDF document text
    • http://keacg.com/upload/files/geriboresosanodojo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/mc36qi75pf2eql1art1s8vo8e8/warekubefotu.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/mafivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 5468 bytes
SHA-256: ba75ddb81c9dd4bf8a96c9d3a0ebee41d40e44762508381f18a41e8b636fce9a
font_01_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 11520 bytes
SHA-256: 0e9f39ee5d9d427364dd911fa0b378079e88904b3a677a61162763af4520c606