Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb929cdaa7cbba4f…

MALICIOUS

PDF

80.2 KB Created: 2021-08-26 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab823f6fd249e6098b8b62d2c0e49602 SHA-1: 2293e55b3b0d0ccfc6dfa0cdcbf4e61edc9f9867 SHA-256: bb929cdaa7cbba4fe6d7645a7faf3a5a4a785c722c2b4b4efa3c58b16a30704c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xboxheerlen.nl/userfiles/file/wonuvitijukavatufaj.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bfk7q7b90s9hrmaak0h0qmttm4/najiwedufisorupomifafaji.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zomadeninexokotadefikowi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e4bd8337ba9c01ea5ba8105d7655d73b/sokexupexugirojuxavu.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/66122227066.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/61452579756.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/wokisijetajigeto.pdfIn PDF document text
    • https://kildevangen.dk/files/48845848864.pdfIn PDF document text
    • http://krupongs.com/images/file/35617500278.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/38785022746.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bavozasofukokufon.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/2163823717.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/37632515733.pdfIn PDF document text
    • https://inncredel.com/uploads/95289907309.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889347666cc---getagider.pdfIn PDF document text
    • https://tuttoadomiciliocn.it/file/liboroj.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107280148139797015g975b.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/zuwajimubimig.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/48194848693.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7080c0c1c9e3074f8e0eb659215c19dc/71597213207.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/25390052347.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gb05770tvre1anqh7ah6e4fk1s/71307423007.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108132116220082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+file+in+photoshopPDF 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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 16892 bytes
SHA-256: bd0efd0cf44d046a17320d4dc89a676ecdbe885807220648433af1becee0abde
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 10336 bytes
SHA-256: 254627245e50396753b63ffb48ccb2d605ad2ea3bd1a13c30e1d76ceaf0e29c7
font_02_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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