Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb447f63cce04be7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 05:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea57fba3cceec20bb571af0918c28bf1 SHA-1: 18f35fcbf6abb221e3c5136a52d9dc16d573bd98 SHA-256: eb447f63cce04be7fecec9b9fd5c41287509bae9ad9d4422106b805df7bc7c0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The presence of external URIs and the overall structure strongly indicate an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=letter+of+employment+pdf PDF link annotation
    • http://robalton.es/Albums/images/file///27938954308.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/28d7f48738ceb355a9cbc32a81c0aa4e/xefalusatam.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d149bbf422---61171850738.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/4fef46v39efidelqbt2f8deai2/65455637633.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/wokunedudomuvijudasubi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5568e6aea---tozilewop.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/7d6fdc8e6176e9d6a090362b99d94f7d/tajofetiz.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daf30834450---radetejifi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe07f816f1---13113732612.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/13911811241.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/bavetuvopiwevufow.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/wojifijofubipuparifuvu.pdfIn PDF document text
    • https://studiorampinelli.com/file/46020627485.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607065878d9a7---mejilejomuzigomi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ded508c7f0a---losetotazesegunuzano.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161168ab25a9fc---43584034132.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01cc158287---vekisunilap.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608211b30baeb---zelulafitadofivuparuxuw.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/44983111097.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f224bc7415---sawimumu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e7e556fce1eadfd406357a8a5a94d12b/54580613072.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/nelaruki.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/4242352644.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/21915181198.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/16372335943.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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 16604 bytes
SHA-256: 2f56927e6f1474fe33d8fd65ce063b8b89a9a4403585469b08addb1c2f5cdfb2
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 10308 bytes
SHA-256: a09e907a59dfafd6ee4a1bde01ad9a7d65e08bd1a741526e650468a7427d32c3

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