Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac17feef3ef86d12…

MALICIOUS

PDF

105.2 KB Created: 2021-07-01 11:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: eb65af4a070c40f5539c94d870f1d5b9 SHA-1: 122e5eebb7808c865bd017551ed2727e0d5eca20 SHA-256: ac17feef3ef86d12b25542612274944aef2a68a996c38ca83b6dafa52b9fa60c
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content. The presence of a 'link farm' heuristic further supports this, indicating the document's primary purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://pixomot.ru/uplcv?utm_term=programming+pic+microcontrollers+in+c+pdf PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bdbe9d84cc2---mizevureratebazunazij.pdfIn PDF document text
    • https://samowar.me/userfiles/files/96568090851.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7cbc6735d3d9ad9a087db4e3832f158d/39576211196.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/2388011913.pdfIn PDF document text
    • https://people11people.gr/uploads/File/semabikawubexetaziz.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076b31a7bb57---72358853568.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/116c9cd9b6ce8c44bda212d5ffd10575/gusasuwifalezelesufoz.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/miluraxavalisezifax.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/9207741306.pdfIn PDF document text
    • http://yilip.net/userData/board/file/4246223398.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tavijirafaxidomi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d03c6901---85684114924.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7938603945826adc21c75bb558c9bfef/59615258455.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607d570e51708---16329667865.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9af9a2d987---60242836790.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/sodamav.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/02702509e36cdfe07339e6f89b577d2d/59109650236.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/lulikedarowo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c534038cae4---13164342965.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/20273177852.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bbf75190---fupetivitifipuvojo.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/27888199565.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93d7b2f56---bojavej.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608877f82a308---47198448761.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_off000134e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 17976 bytes
SHA-256: 88a9e1c1a74ff0969bbd21fe827c8b2709ed8704718b965131ca556a4be712e0
font_02_sfnt_off00017c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C7F 10964 bytes
SHA-256: c79e0e8780bb3684e1c00fad4d7ddfceb8e0245d60d49bb3994da996e685ed19