Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00a709ae039a4b9…

MALICIOUS

PDF

83.3 KB Created: 2021-07-07 07:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcb7af9ed28e1edb43d986d1bf97de74 SHA-1: 3de0838509ab611bd75455743599d22da760b4ff SHA-256: b00a709ae039a4b9fb39b2e0f8ab9aadb1c25c812c51a2632f3e7a22045e7ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the links strongly suggest this PDF is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a8ad120d4ef77ce4223d972d38148920/54585765042.pdf In PDF document text
    • https://ahha.az/userfiles/file/74154493051.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/jebunubumigifaxar.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070719227686.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/58012250698.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608036dee07f0---95971529270.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5b255d18dc71eb098b975fec83045c9/9838209199.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e9580e21---bawonugimezifuti.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/fuwanesutefum.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/93244347672.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/jalenuxikigaji.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xatat.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02a5e3605---49287166064.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cda8f9c9553---57850938769.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/e168b22e507bb87347a438366d16feef/86771909453.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5652c5caac---rokisunepakavewutam.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c0825761990673c0552f0f8861d7193e/11358053752.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hslgg04jj839feuer9u4jdbt2e/dusexakawat.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/406795367ba9ebdb7c8978981b811d30/fizajiwowedid.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vh3qms1gv0mq8ssfhv6mdvk827/sazubelivuwodovi.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/61310058191.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/pupitob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=late+complications+of+appendectomyPDF 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_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16492 bytes
SHA-256: 6b8f5ad96725834c0750ca25e313cae772f678b92b2710e86118bc0362b2e445
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 10752 bytes
SHA-256: 20e33019e5b88dafdccaf3b55ce2c9abbb347586b1c4b0114bb0d877b169268b

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