Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc16a9c1c22829b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 20:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ea872b172a4a704cf03a6d5714f381e0 SHA-1: 65d862ceba60847ce4113037ec3d4e81dbd26c91 SHA-256: bcc16a9c1c22829b0e68fc8f16908c5a358fba152b0d429f089a842935e35d87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a malicious link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests a common tactic where users are instructed to find a password for an archive, often a precursor to malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=gladiator+glory+mod PDF link annotation
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1775710513.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/66478201471.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dudejagagotixokeg.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/13483207143.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://ttc-investco.com/img/files/topatosuzofef.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/67572160771.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614e0a8f91720---51457469432.pdfIn PDF document text
    • http://esejsc.com/upload/files/rimexurimef.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/dobonuvifisekezifino.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/93993839220.pdfIn PDF document text
    • http://dharkaninternational.com/survey/userfiles/files/19598271647.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb8f18d063---sosewixiraxadorileb.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/kawajuzapajonuwudali.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/29160262277.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/gagerakuk.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/mubonukawawutiji.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a30754c19---96382761017.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134b6c5b2d34---97218925679.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/vufidisoludop.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/sizaxewerivu.pdfIn PDF document text
    • http://tatooazh.ru/files/files/2168954261.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nugitavukivubegupu.pdfIn PDF document text
    • https://terracell.info/images/file/6054769479.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_off0000b76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76B 10340 bytes
SHA-256: 0099dbf39991a66f781a65d4119a144c16cc7346fee7b60c30b14a936e3504f6
font_01_sfnt_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 18816 bytes
SHA-256: 56412a93766965275329bc9b37f525094a25ed3ff0ebb65ed285ff8c47e4f7d7

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