Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0cbce479b552b2…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 00:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c9ee1618348cfc6b5920f3f04321048c SHA-1: 9a83aa23a60c7d037771dbce87d9e57dc4f38d97 SHA-256: bf0cbce479b552b275b8e96e3075d40b8898f91c85cf3a4ed2ee886db10b1090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=the+lost+book+of+the+white+pre+order PDF link annotation
    • http://mwcapital.net/ckfinder/userfiles/files/46761695891.pdfIn PDF document text
    • http://pronobile.com/catalog/file/56022518313.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/43882963682.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/ruxone.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/kamamexixufalififenixo.pdfIn PDF document text
    • http://belloverde.net/emailer/file/kolezukaragesu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/052461cb3a6ae87a8068b789914c465b/71411764665.pdfIn PDF document text
    • https://lederstuhl-shop.de/ckfinder/userfiles/files/13356699609.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152efbde24d0---rurewusupu.pdfIn PDF document text
    • http://klinok-saintp.ru/files/nipajumitijibanel.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b671f4a5802c1ca48086c06993c21b9b/24338329520.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/xorizegedafububen.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614915303e16e---86009111516.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/pizibazukaniwutujema.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132ec2a075b7---vutaweli.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/febasetivesefowodupiwo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e30e689758---begodikopibiboba.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/412b645d2d1d955d96dfb5eb2958cd0f/31248250692.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/71166107782.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/nudewugoveraremoveraziwun.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/tojojibemosolujexiletoken.pdfIn PDF document text
    • https://projetovm.com/uploads/files/34493419978.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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA76 15088 bytes
SHA-256: 4b13fd7f0422b0d96e9057eccdb4bea7c524e48154b505eb9f48da64012b226d
font_02_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10608 bytes
SHA-256: a612fe9cb147eb7bf7545a3c9af5dee87fa8281d5326b1b7640e79e1f8fdfc6c

Open this report in the interactive analyzer, or submit your own file for analysis.