Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf03d0e9606534dd…

MALICIOUS

PDF

78.1 KB Created: 2021-10-02 20:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 908ac8fe9b50438f18d774d166125aaf SHA-1: 3baba9e7a6b3fdaacf15152669f2dc5c85292089 SHA-256: bf03d0e9606534ddc413824530b8095403356467e34778d02a46d753144576aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and link farm nature indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crysiq.ru/uplcv?utm_term=answers+for+dividing+fractions PDF link annotation
    • https://wic-net.com/userfiles/file/17336212037.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/13712360988.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gevobatu.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133e36e430c1---21804105577.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/gesisumotutofova.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/lelumukeji.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c23529ed795b513f2495b92772fb638a/pabibegulugirafegesup.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/94246911485.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/dukujesi.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/funanojubabejabitezu.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/desurixoxopatidevezubewif.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/76c8447bbf0b9285b902757ee284de55/51188642666.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/naluni.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/bimerudoxifesusopolemonuj.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/vujulopova.pdfIn PDF document text
    • http://quranday.org/userfiles/file/74094640711.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e46d765f2---81937410114.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/fijulineme.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/zegumodowobaredojabizax.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/9072857192.pdfIn PDF document text
    • https://miet.hu/kepek/jedevusivuzabijimimimoked.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ad1827e7e---maluletu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xabubapigulijo.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/80100882093.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/wadejoz.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/wimuledoxudedi.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_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 18672 bytes
SHA-256: a180452a70dca38e67912efe467c83832cb1401943f4261aeeab571d14220f85
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 10736 bytes
SHA-256: 826962ed4a7d6ab2a3c37874ad0c9a263451a03701f60a5ea67746ed238870da
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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