Malicious PDF — malware analysis report

Static analysis result for SHA-256 44606c160350bd67…

MALICIOUS

PDF

102.7 KB Created: 2021-06-26 08:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3acbf0f3d2ce66b7fd9afad0507993c6 SHA-1: 55a0b7ac35ab20802679f0c03eea5cedd1831721 SHA-256: 44606c160350bd678f72888c236072e6934eb92a4f4e39bcb168ced283d423e8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and link farm structure indicate an attempt to lead users to phishing or malware delivery sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608439bcd86a6---18542570853.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/95d4f88911db04843cf408f9bc6d32d0/85967521267.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/43271525916.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/96973077011.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a65925eaab---28956088278.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/cs4oll4vabou1vqts6j46sph92/wupavesatejidu.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/vimupulitupopojirod.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efed0d956d---maronavakeva.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b31096cba8---87728482183.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cda718330---ruxipifopob.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/8fbf1c1da91a9e65d506efe4437efa31/45664054780.pdfIn PDF document text
    • http://siembra.me/uploads/files/91702554322.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b590800d2d1---86010051536.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/mawanora.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/vukupebepususivovenixom.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/iaj55dh2qugf3vcb091hv5fiia/63894681380.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/lurokeje.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b17df50bbd012a4b4d2eba3113279a7c/maritumowejiba.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e697417c3137262699d5753112bd9d92/9144002242.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/49224537953.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2443b8522589ff394dc8b1c383c2e6fd/59743029951.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/79554936416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=managerial+economics+in+a+global+economy+7th+editionPDF 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_off00012ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 11116 bytes
SHA-256: c3691c0974aa847b4c47a984da03110bb8a660a8c034339ae70c0e1c0d45073a
font_01_sfnt_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 17812 bytes
SHA-256: 968ca9a7e0f40e74758fd7fd328a34c63e015bb30f0e2c8c6dcfd7cf51bd2156
font_02_sfnt_off0001753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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