Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3cb08f4d7204ac…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 08:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 002d4f9816220438826185f10566d338 SHA-1: 0f81e04103ea1200af83e09718cb0da31f907e54 SHA-256: da3cb08f4d7204ac5d38ff95884f831c86180566a938aeba469e7f67c792c3ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://chinahongji.com/d/files/zomudajeloxapuvonexunow.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160872649dab14---bizajotaz.pdfIn PDF document text
    • http://ndt-ultratech.com/files/jujamuvila.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/66484166694.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///motofupejurevutu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/muveburefa.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/fefakuzupagobilu.pdfIn PDF document text
    • http://cochemical.com/upload/files/duxafokitejex.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vafixuju.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/tefefisusodupudenabamepal.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c468a1924ad---7354676751.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/93358949929.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171074291230.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2m27abu17legtsm4eism7j5ima/17718832836.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/18732325080.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/31781584269.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/zodulowojetejexujuvawebu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a00116c35e3---79052043240.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/repebelizozumisuvoxijogo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d261a76966---13512762714.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/46051419198.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5cf3f7b4---jupasiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=evaluation+and+control+process+pdfPDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 10764 bytes
SHA-256: 53b904cf2849e33c97f8a7a405cf3e4bb1f6aef11e56ffff68320ee2e3f506b5
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16304 bytes
SHA-256: 9a968feff23bc03c0e1687fdc5372291fb70353c3226910fc12f4572854a9c87
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1