Malicious PDF — malware analysis report

Static analysis result for SHA-256 c637ac6b89d05ce8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 15:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d95afbddf037e12fccf31a4b8664fed6 SHA-1: 6a1aa876996e27c216f4546303dae8dc77478008 SHA-256: c637ac6b89d05ce8f4ef4385d3f35541ca9411ca057eb4f43617f11d39f70fee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious PDF that contains embedded JavaScript, likely intended to exploit vulnerabilities or redirect the user to malicious sites. It also features a visual download button and numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for initial access via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=new+malayalam+movies+free+watch PDF link annotation
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/82722868035.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab331aeb6---35225115522.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/sadilibivibami.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1f20fee6---18017249754.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/77344774381.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090407522749.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/47997023859.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbaa97e02---49971540832.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/lilazidivadomageben.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/66694111026.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/25135772267.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c503404ffc---75853068273.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/7683493022.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sanukagewonejevoja.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/sonafudofobasemefoguf.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/kerevezo.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/21809600954.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/nivuzowobevev.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/52322324432.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/lejutoke.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6354d5687---lubedu.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/2026777901.pdfIn PDF document text
    • https://isosklo.cz/uploads/palojopemiwebuvegezek.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/18951880199.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_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 16996 bytes
SHA-256: 961060b9769110c68334ebf98759548394e62e743274c4acf5260a9a02b74314
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10740 bytes
SHA-256: b775a7d2fcd5fee0e19347ea702b085460117f90dcfbcc03e84c2df0c9436320

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