Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cb4ee4fd0eecf5…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 09:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b086ebef5b4fb7430bbb4701a1dc3510 SHA-1: fca43aa5c5ea021c6fe035f9d91de896711dbeff SHA-256: b1cb4ee4fd0eecf58b3f0ca1fbdc87da7638650ec82e64ccb0ae40942446a7f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, characteristic of link farms used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://amuseonline.com/absite/userfiles/file/zufezigabuj.pdf In PDF document text
    • http://hoachattn.com/image/files/didixavapagabapedumiposup.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/74488928144.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nineguj.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/97166625757.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d9f394a3---zukadefivele.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09d631d17---noromezatomaserifexikud.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/67661910622.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/widosibavubobusiwaweb.pdfIn PDF document text
    • https://teamcode.net/upload/files/50032061403.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hjp6qj7tks9a60lbi9u7v9qt72/2898699309.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/87200889455.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/44531559189.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/ripewejifoxavogutaneber.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xiloj.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/bixudugepepifej.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10702428869.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d267894f9b---74720082647.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/2206557268.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/24219323177.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/12471376847.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wodenipupobutoxagenufib.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/fakoluxikedimixabato.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/bomipamamol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+latitude+value+of+the+tropic+of+cancerPDF link annotation
    • 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_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 10876 bytes
SHA-256: d703e2d99f56033ae389b659689f2c34b0a68bd396a52b3c9fdcd924cbc79ad7
font_01_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 19232 bytes
SHA-256: b11e832707da9e71d13a40f97a6e6aa2bf19fa33558b3a2ecf944985cc303ec7
font_02_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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