Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a67f7b6ac8f920…

MALICIOUS

PDF

99.0 KB Created: 2021-09-04 10:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e958c22e0841017a488bbd2588072f3e SHA-1: e8597d6c259ffbb406f4a81d9f2f32ab9092ba0a SHA-256: 90a67f7b6ac8f9203626a97020a273ed27e7d5dda4feab85214bebb9ccca877b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites, suggesting a phishing or credential harvesting campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, likely to disguise its malicious nature and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ghl5ihe4i3e5djgg1jla2u4kdb/35170763915.pdf In PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/gipefoxopolanabire.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76ebb824f---72486978295.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/1564966555.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/45454844521.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/57313606255.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/63526250252.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/gmeu4uardsanipv90spuv3tgf4/lumamawixezola.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/33522458765.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8a67f2b8a---81332558839.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/goritutireburo.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/tilolugumoris.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/9905459905.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/vukipivawunezebexi.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/50498033311.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/22006123748.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/398048015451620484292.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3492fd72---97016052187.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///vifawirivijotunodawokopi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857c7e16c40---73868466008.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be3f4785ef6---nesotepodasov.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/24/33700292044.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/4929dde3027b29c920191ee974d9308c/xowijolatajiroduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=solar+wind+hybrid+system+project+report+pdfPDF 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_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 20804 bytes
SHA-256: 2f1660587bd9b921969746683baf1a561ad8ea26fa29f26a4f031986e7efc9b7
font_02_sfnt_off000163be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BE 11432 bytes
SHA-256: 9a63d1f6a43e4c07688f8eba8d55397c3d646abfd8749b99066fc04b570808ff

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