Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a5e012a7268cd…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 12:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 747e5627e57c7097f6ecba17e1fff02a SHA-1: 3ba4e38a3a20823680f089262d31c072f27a20d6 SHA-256: b86a5e012a7268cd2ef91d71f2555483c923fb4d5e8425bddf332863f4cddf6c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://julianina.de/upload/file/kavugusivot.pdf In PDF document text
    • https://bouveau-consulting.com/userfiles/file/mamonajixujomuzipaped.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/debetipegudupafirejujo.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/11893783560.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/49412171608.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/73065513674.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/80696354774.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409352156b0---daribuzoguromefonapizozer.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/1pmob2ph5d80favmr4usuf05k6/figinonukiku.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/73826985534.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/37705806379.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/62240071615.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/45148402475.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/dutozituwij.pdfIn PDF document text
    • https://priscar.com/documents/files/27212089081.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/wutuwefepinojisilona.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/subojuwobuxijilovunajalaz.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/73232727471.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/dobevorelezez.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebf9873de5---zaxozamupepetawivisexi.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99289195832.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/nevimirowatowamisavafasa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dd08f2c3---bogumizodetek.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/tebezarifarimolijozisifu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918153846513531.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/25383044159.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479cec37a0a---3371468554.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/16795684528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=photo+grid+premium+apk+downloadPDF 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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10948 bytes
SHA-256: 21fc66e2ea90dae7f5ea74adbbe0c641604238bf98d064dee24aaba3b47a21aa
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16680 bytes
SHA-256: 9a331e0065ac9d306d9079592453721f00e53ad29c68eaa19cbf47aba7c2ffae
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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