Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6d5bb5a2458b75…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 14:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d70e7148457d38c1de06c6496405c7fa SHA-1: 750b432ff7a7359b9d097d0f4e616c173df35c9a SHA-256: 4a6d5bb5a2458b7566e698b657ac76147c38981882c499f985bb4207e00e5e75
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially compromised WordPress upload directories and disposable hosting suggests an attempt to host malicious content or redirect users. No scripts were extracted from this sample, limiting the analysis of its direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://denprokhorov.ru/images/file/bofaduxo.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa93bd8701b---nilida.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/23555452082.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076136160ed9---41324545498.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/f7c6cb4253f0052d6c3e0109d2ad8dc9/tugatimijowuxatunuwa.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/54430221895.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/tiwadulara.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/33323363847.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/26409673272.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/11fc8b3f3b9980b4664696c0d65235a7/zurovobuxirazad.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/kukulikunapaz.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/13173090902.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/31fb0938798e565d45c9221b5e4afaa4/nijotibijepukoduwen.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad140dcee04.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/7f71a6c23e817c4d47c0ee27f94c6890/losube.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/48774930339.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ba2ccd42---vuvogapuxipebutil.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c216fb96d6f---32594828834.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610728914966e---98268662337.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/17042611556116ea1304e0c.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/098281611287e5f482702d9e4b2228a0/ditos.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/wapunamir.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/76f62df37c3996d49e9ca34a03754c3d/subimazafasata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=volvo+bus+ticket+format+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_off0000c75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 11044 bytes
SHA-256: 1e5569f23dca447404df62569e662eb3b2cbe26475257244675600e5cd084980
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16964 bytes
SHA-256: 004af2bad02f9b0a8e3c843210cf8e83fd0db17cba7d5c45b5c6d825d862513b

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