Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2d04f23d91ee07…

MALICIOUS

PDF

73.8 KB Created: 2021-08-11 12:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f6e982c9657e2ee11a24496800f26564 SHA-1: 7b8caee39a9bc3aa8011de50d89f2eae87273ad8 SHA-256: bd2d04f23d91ee0724ee2116060d6bc1fdde9331b692e1d534bd569025086c78
156 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a link farm, with multiple URLs pointing to compromised WordPress sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. The link farm structure suggests an attempt to host malicious content or redirect users to phishing pages, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c48ca9fa---75485329769.pdf In PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/palebejapubidepa.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/290930116.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/majazunatuvuzoguwunozuda.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xuradojevavuselesufuwa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9650c9ded31f526ad7012b78e499f4ed/movijiw.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/60783856145.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03fe0a3dd---dewufavop.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cd69e70b---kopodejikubukalus.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/34195138880.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/09f478dca68df24fe9a0ea67d9a9ca0e/vibokesubori.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/5061482867.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8c6477f22---98720694579.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/xupuzinumewebefodowufi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/dogimelejusiniwawejanij.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088400c69648---59521750794.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/df54ab36c124cbee3db808df79998d00/65985473074.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/jebokevemafazijanatavejow.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a7ba38f81b749db4c6b5cf4ce63418d8/29632274028.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/nuguvudujudisi.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb669ee97---popumebiwunubagexiv.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/71813057797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pre+civilization+bronze+age+game+guidePDF 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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 10912 bytes
SHA-256: 76e1ecbed65670390f3a9dfeb6138339ab53874707adae78cc3b33c8dd5d91ca
font_01_sfnt_off0000d812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16036 bytes
SHA-256: 3f70b247e6bb89ec0a898e64c9ec98367c56a569206bd23f5e270c02349632e8

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