Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbced9b0ce5f5aa4…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 20:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f57d7ecd9b507cc8a0224169386c42c SHA-1: 412f9c4763065a350d4208f8e95ca34cffe1f632 SHA-256: fbced9b0ce5f5aa44f7fbf0ce354495cbebd104835923dfdeea3262726ad2c84
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including an image-only interface and numerous links to external websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nikolsbeauty.com/webroot/f/uploads/file/relolusifemuzesaxetuvagip.pdf In PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/32975866525.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/nobaponeri.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01c277dc0---vowirilevufasewe.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/33355950806.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/24772115425.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/35467494873.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hqrc4cfsk9ihf90qrqu31rit4t/sowasobukepuxixuzaxemalox.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/88406025969.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/96537964757.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lesapilozidifizepokuzubur.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/xasur.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608231778588b---tetezomepokajusa.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5af7d4da6cc8ded156764e5a5e6f2d59/vobederodesiratus.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/gqk4ilo4mb3o9ahlbgjisf87n4/5146601036.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/31350848869.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1f6b28221bf8e67ff330e965b609ad38/kumima.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/wojuzivida.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160790687c39b4---tubavorikidu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c97bbb99---balis.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf10958fe---jaboma.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/nakuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tally+accounting+notes+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_off0000ae84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE84 14036 bytes
SHA-256: 40e281b1b2b686de30f5d76376a8c9f5a2422a68adbc9b8e2af43b5a988e59a8
font_01_sfnt_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE977 10872 bytes
SHA-256: 0923e260f30d41cf4c71d7c62b06448a88615984179a044d78aa803755034263

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