Malicious PDF — malware analysis report

Static analysis result for SHA-256 3673122ed415a37d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-26 18:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c206e682d11909b2ed9380392390cf7 SHA-1: ba0de9da021b8f87e8ecb90b318e3f3eaefb2ef6 SHA-256: 3673122ed415a37da4220612f99bcb2da10d02c6a41ebc5eaa6cdcb3c26e7a1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm on compromised CMS upload storage and the ML classifier's high confidence score further support this assessment. The embedded JavaScript likely facilitates the redirection to malicious sites or the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=recover+icloud+password+without+phone PDF link annotation
    • http://osteriadelcampanile.com/userfiles/files/dewusudosuluribinok.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/65621384519.pdfIn PDF document text
    • https://eniedu.com/data/file/20210906190430.pdfIn PDF document text
    • http://vina2002.com/uploads/files/xuvamuwegufo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615026cf2e007---55165585220.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/60025606880.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/66578224735.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/pudaped.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/lived.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/deduwewir.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/17546298078.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/zefavorusen.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/dedipegaguguj.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/rixobututimijanezifuwaxa.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/36832125201.pdfIn PDF document text
    • http://sbcnepal.com/images/file/2573774482.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/wumavigoxuxa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485d2074855---dizone.pdfIn PDF document text
    • http://zae.me/datafiles/file/86037473226.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/42199233075.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/5368959863.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d91b57a9b8---mokaxopo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/70863242422.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_off0000c046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC046 10908 bytes
SHA-256: 08c5729cb3279af557b78043353eec21b0d82c9308e513cdb574dc38be4d79ea
font_01_sfnt_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 19360 bytes
SHA-256: 9e3cb64675a17ce3ad9924078d685c95c616f93d7f0d216d31fd9d7784c8966e

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