Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a65d7d9671ef56…

MALICIOUS

PDF

97.1 KB Created: 2021-09-19 15:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b941734e4da3dd2760e8a8fdccf774a SHA-1: 10e55b8903cf4cb26c1cffba2828d15502289946 SHA-256: a4a65d7d9671ef56f8283a3a07d605a5c93a90f32cfccc6c22f825750c6425f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=captain+america+civil+war+full+movie+gomovies PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614046ac75bcc---buruninewojenojixu.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rugajome.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/82707309518.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/46978166689.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210913012544386277kx98f.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/65050744767.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/93087458222.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/92957504717.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/72411176553.pdfIn PDF document text
    • https://paperland.bg/uploads/file/piwikupexunun.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/goxirogidarax.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/topukomufaluzumomugapumuz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137534ab7c72---dafusifajirikajesi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc11c4413a---64008968372.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qthjlkl4mf5ltu65i0dotl7i7c/66185883233.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d91c483089---tovijikigokaxeb.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/78336389514.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/46534786614.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/385532581.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/66360124252.pdfIn PDF document text
    • 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_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 22524 bytes
SHA-256: babac8788c7096a2f3cb4939408f719208f06723fd38ced2c93ac3ce3e49bdeb
font_01_sfnt_off00014333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14333 11108 bytes
SHA-256: 5719069079e0aeafdc30be070482aac2c6358444d3eec63f3dbb8885565c56cc
font_02_sfnt_off00015d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1