Malicious PDF — malware analysis report

Static analysis result for SHA-256 305eec7ee093a62d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 09:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13b9b8528ea0b94139ca0bcf373fe28f SHA-1: 841717ac05bcd3dc152c76198b583b2711f91b63 SHA-256: 305eec7ee093a62d0dc4747754946e8e9f17c9078fad3701ff206157aa0f3ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=vlc+media+player+android+auto PDF link annotation
    • http://ppogrimall.com/upload/editor_image/file/81552471358.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f0b81ea---20236366108.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/fofowo.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/dujotewatidowudurezaze.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/49327999863.pdfIn PDF document text
    • http://rinsacars.com/files/others/luzagajigazelidivizonu.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/risul.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/fubewenisigut.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/r4qr8mkqiskit6nhv0s22qpdg3/vagopesabapeletizetul.pdfIn PDF document text
    • http://newshop.jp/archive/file/zutefiwalifirefuli.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41b981719---telapexazejokeruzojuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40640822762.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d54f29b3---68564387111.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/61496848772.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b430ccb54e---mepuxifili.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/sipuwaruzuzagomokudeluna.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/rumitomaler.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/woduledejikafomumibup.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/23437812214.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/madifanuzedari.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/buwosezosevefafipokumom.pdfIn PDF document text
    • http://benly-carson.com/product/files/98532293038.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/33372777528.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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10688 bytes
SHA-256: 81d061393abc1960a3bdf56b845b432138f8c6d2e4a9a8efb033dc7886f81b1e
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 17172 bytes
SHA-256: aa6883aa3cd6d9fa2d6562b231f6a234276c1e6aef79ee6fba01439109219c46
font_02_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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