Malicious PDF — malware analysis report

Static analysis result for SHA-256 8305f842b1d7347f…

MALICIOUS

PDF

84.4 KB Created: 2021-08-18 20:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7cc4d377fdabd7de8fc5023f2e825013 SHA-1: 7c82951f6ed7ff11f459cf47a62fcb960f02b110 SHA-256: 8305f842b1d7347fe2a86b0912f7c573cd00e6241d6d0f90dff6c3d95903b51e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable binary data, indicating it is not intended for human consumption and likely exploits a PDF vulnerability or serves as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/lq44o2l5hmoiok8gm0tjchij32/88235826590.pdf In PDF document text
    • http://henri-ruch.ch/doc_pub/file/63054904244.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e295931cd0909144c9cccdd83fb7b172/75832605713.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607779ef89059---62250476720.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093b30cc4de9---80389966354.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/501ab67c97a9d8f68d37ffae66801f03/99909592634.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086b634e164b---romonoxurowozabukozena.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc310a9969---45938749447.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dakumekakomozebunuru.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/46624492312.pdfIn PDF document text
    • http://licausi.it/userfiles/files/kalixomemubimejukodexa.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wofisezusafinonon.pdfIn PDF document text
    • http://gibisch.org/files/files/tupom.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c6fabcdcd9f---jesijojakamor.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/42816491009.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/57365472487.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/26945509478.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/zunamazikojisepizukaduga.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fc5574a90356d74e3ef11271ab1894ef/96200054057.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d89400dd47e2059915080d73a4fea47b/jelunu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e371d59cb7a---3920330615.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/64603903644.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/lufalidavipi.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0d0239c33fbb8ada2f3d1e3c5e7a3963/58803979476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+clean+a+breville+air+fryerPDF 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_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 17348 bytes
SHA-256: 3e750a6a85066e0ddae48e618a528cb24f9408a2dae56e0d843d45d314b7bb0b
font_01_sfnt_off000112c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 10556 bytes
SHA-256: 2599ca5d9923ce8e573537eb1ccc899e77da3f4a83dff169baccf25e1b66f462
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1