Malicious PDF — malware analysis report

Static analysis result for SHA-256 684d5be5785f52a3…

MALICIOUS

PDF

85.4 KB Created: 2021-07-21 06:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d8d8229a66307a99ca7d7d9cf53d82e SHA-1: 847732e06d3a74acd1263441fed81fb11f470007 SHA-256: 684d5be5785f52a3b8a3e8114536f957098e364999f21520d026c5b3558feaad
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mgogs.com/mgfiles/file/23746414202.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/91081373559.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/47d6cf39b9311ab3ec91665f36649f02/fowezupimukokuwigon.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e317ff16---7015832972.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/6a9f64a21d4f997c6d62ba753be9e97b/zowetugimi.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d010c6e4401---fukeme.pdfIn PDF document text
    • https://angkagenap.com/contents//files/1785545785.pdfIn PDF document text
    • http://vejwun.cz/images/gabeladugikejazuv.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/728303124.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2de710aad43fb2440ca8029981ba5b3a/31844734872.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/td720b7fiukmbvdhq1lflksh9o/7561509947.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/faxidemekok.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/pamafirubarofimubido.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/32370601647.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e46a2d431c23db10e2f7df9b9be4142/pozulezif.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/kgv0ahon7p6ggk5rpo1h67rv52/bawipuwimegiribepifuvatik.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/larevegazokasukusera.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/74144801353.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/dajesodetarigubotida.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/50111049166.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b773188f295---bagexibozu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072069733a29---lajurorege.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfe38f31f---55073510693.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2ff564def7eb1661e81b32041d9d411f/7515835312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=business+continuity+plan+example+for+software+companyPDF 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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 16548 bytes
SHA-256: 1c8d250c4766f128eb668e8c7e66d40628f2ee4882078b14ad049be8879d02e7
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 11096 bytes
SHA-256: 060d5ddfb09effaa751282e58a8365be6ab34a04bfd0f959a7e2cc1f2a2117e6
font_02_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1