Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c217d25f8a1ca76…

MALICIOUS

PDF

85.2 KB Created: 2021-09-07 22:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83254a03f6f472274ef2ef717d416359 SHA-1: 255800446b9088d7e831d9892f2f66f150948638 SHA-256: 3c217d25f8a1ca76d1a5807db84efc0c79617cc295d406593aa77418054f6e33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://itineraire-consulting.com/ckfinder/userfiles/files/godimemanesukozesojuzawed.pdf In PDF document text
    • http://terralis.eu/catalogue_dynamique/file/ninepudepumilezibez.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/didigogeketubasevur.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/21246527818.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8204552e002fe7005b8d3008230f2b90/dibosasulunugit.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf931ac5c51---44602400443.pdfIn PDF document text
    • http://ping-property.com/user_img/files/puzov.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/sibiwopewidobilepe.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab677e001b0---jexexerodixebukanasanuno.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/16197502060.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v16qdvdp0luntsejrj4ffto5g0/zesirekixix.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f06117f04---jumepok.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/6104ac30edbbfba576837877e017c323/81951413961.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/kujenefagowulakotix.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/vodibi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608034e55931b---34372564208.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/97608284200.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/zoporeguko.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/5ab7575ec933634b61ee5fbf879c4346/91076681612.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/0gbe007hrkvpcn80udn7ka5b5h/daraxefuporosiba.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/fee54cd4b33dec4d3114e8f7d3b525ba/10013728983.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67bd5aa4ca---tarakasugixebopowosas.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/voforujazilatedexotosuwif.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf631bd438a---8859756186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mirascreen+g4+user+manualPDF 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_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 10524 bytes
SHA-256: 34dee0f6aa2a94220af425baadca74cc0b2e823c820c388061fde232469bbdb8
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 17460 bytes
SHA-256: 0f4b29850b65a82c50dd763cf579322976aa77cd434f542dddbc3da99ce0275c
font_02_sfnt_off00012f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1