Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d38ac4c21e4954…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 06:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d60625ccc278d2296fb165661389be3 SHA-1: c6606dfca533ea67f53bc9a8d502ae14691b5547 SHA-256: 36d38ac4c21e49543f6992d6cede976ee0a811de1d38498d499b8a559b0f20c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. The primary function appears to be redirecting users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=dragon+ball+z+putlocker PDF link annotation
    • http://denis-lefebvre-services.com/fichiers/file/pabonekawu.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/vodepodowagumezonupa.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/rutodekip.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/nizigave.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/67574681827.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133376d57848---22648875054.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/rinigidivitoxiduve.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/xenexuxupexif.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/vonot.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/waloluwo.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/xibakagodaliperowo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/pudisigapivivuxodelelowo.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/70841501282.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/xabijopedurar.pdfIn PDF document text
    • https://auto826.com/uploads/files/mitixuxu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ddb926cd---mopasizixafujipodid.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2f10869e---lutegejolozugarepugisul.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/82254543104.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/tojebariwu.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/33795194605.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zumamiwosonibesefofukupop.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/77525401155.pdfIn PDF document text
    • https://foulardfotografando.it/file/62619892375.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/fiwinigalomosadetetej.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_off0000c35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 17844 bytes
SHA-256: 2859977194d510a44c0488e239d375d6af01d7d17df3bfa74de9fcc1b0d29cb4
font_02_sfnt_off00010952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10952 10680 bytes
SHA-256: cd93e3e8081fcbba52f60783edc759c77326f8beb1bb92a5ec947e918141a541

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