Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcdef5a8ce69bbe…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 19:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dac3f42acc041c5a296c4cd7249eee0a SHA-1: 61c9ee41ee3a3bb95198c919dc7121e6369ef840 SHA-256: ebcdef5a8ce69bbe7f636a67e00da55ad4ace7fc6f3938da664a42923ef2e49d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=how+can+i+facetime+an+android PDF link annotation
    • https://espritgt.com/userfiles/file/86468552009.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/vajuduganojujovolimekop.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/36361354301.pdfIn PDF document text
    • http://biosite.ru/images/news/file/lalotigesewu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161523e894624a---najojawepolota.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/29391775962.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/fozofisovomujep.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/nokivamuperuselurexamor.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/76859848961.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/larozozilejosetotavu.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/2cb5d9f25da78efde7b920e792b2f078/modom.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/jufebuneforufe.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210919091703.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/54921447197.pdfIn PDF document text
    • https://posh.hr/files/lalusixuzupilorizo.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zunekulebajopo.pdfIn PDF document text
    • https://ratodua.com/contents/files/21750414522.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/kafew.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7358df3e---49468963429.pdfIn PDF document text
    • http://cmtsport.com/pliki/gijewamaz.pdfIn PDF document text
    • http://friulanapanini.com/images/file/29899965346.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/fojapofe.pdfIn PDF document text
    • http://espwireless.net/uploads/file/pugugaluter.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613317eea0e1b---bopepi.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_off0000b32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32F 10500 bytes
SHA-256: 64962d518104b0d5409a94b1a0ce715697c207cbb5e38d5930d8fafdd58b49ff
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 14948 bytes
SHA-256: 9a25407104d37f4f03b9ff6e5bbb005041d65e416db612a5b235b84146805baa
font_02_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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