Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e74023e1b4bb870…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 11:21:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c05d38f4e4f814850aa622e1576a719d SHA-1: e5eaf52d356a907416a87ebe8265ae0728089408 SHA-256: 6e74023e1b4bb870548a414c08d4da891e5a18b1c0b7c537af9e326940193567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are identified as link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=mi+tv+file+transfer PDF link annotation
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/91216755293.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109020448173522.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/32680457569.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/7577979055.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/buxogipatelavuz.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/sigurezi.pdfIn PDF document text
    • http://vitrine-prof.com/files/66422290183.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/33009119530.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/20654154610.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bagowiwasalewikinebuvat.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/40174583649.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/mofitunirovux.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/38371998099.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/72806584616.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/rowadotelux.pdfIn PDF document text
    • https://projetovm.com/uploads/files/24500763847.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/dorisafawatebulanoz.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/55819860584.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613263110605a---kasajuwubinogilolemifa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a9d545219623c86ea20435a7f51e4d70/74279226599.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2c902e10---33663162667.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baxukikaxuzisubevilaz.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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 17760 bytes
SHA-256: 445c0757a87ae541b4196c07ff668812599e96cdc72b1a49bf5dd7214b188e89
font_02_sfnt_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 10144 bytes
SHA-256: 9c7306e74ef43c41b127931a7ac7cd4fdf48c0647f303500f035e7695578e772