Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d434980c29b0ee3…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 09:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0aa6693278adddc5ff2881e141697def SHA-1: 65a170af0fbe361ff5d3e5fbb3321af325f4adb0 SHA-256: 8d434980c29b0ee3a7f35645371f7e44a9f17fbfc4dbed50157321d415e68b37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains or compromised CMS uploads. While no scripts were directly extracted, the PDF structure and the nature of the embedded URLs suggest it's designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://sk-uralstroy.ru/uploads/files/61906924292.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/45105113627.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba268c9db---konofarog.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/51423951262.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/1065431904.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/zuwekiwonaw.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/54719605754.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/lovurakugununebesi.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/tilepuvezebujojatijuf.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://mrpressconsulting.com/UserFiles/file/94537663603.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c48457a4b033ea29a214e5e528d14913/lajoviwesozoxekaleza.pdfIn PDF document text
    • https://birotex.rs/images/files/tofijawerika.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/fituxunelumubabun.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/2979639059.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/xidekesapamozuku.pdfIn PDF document text
    • http://rurisnet.org/images/file/91744662458.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131675446610---76331565914.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/662475529.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/kuziku.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/3432262419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=root+unlock+my+android+apkPDF link annotation
    • https://easyown.ddproperty.com/datas/files/7586566237.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_off0000b56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56E 18784 bytes
SHA-256: f2a7db939954854474aa0c89ee7a583eee127d2835b80d3b1ddd1b2226edeba2
font_01_sfnt_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10724 bytes
SHA-256: eef8eccabf4a0fe753c17513a92ace31a91318f8d1d90feb214176964ee53eab