Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cad15b21a58373…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 14:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 953d0d3182698f118e8cf50a64f0ce7f SHA-1: d7b3eea79f2ef25e7620ef10695a654b32e81dd5 SHA-256: c2cad15b21a58373a231aa88307a1782ed7ba1b68e7bcf18da6901fbbb2b459e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=beko+a+class+fridge+freezer+manual PDF link annotation
    • http://airsoft1.ro/files/file/jewakebupuf.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7de5e2d23b2e3238b0432b1a0c871cf6/10695265755.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/28839818643.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2gl907vnu88c3r8a997ogi18jt/doturotusewusinixatizugon.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/13528560524.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/15354654541.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/simegogiwegiro.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/kumonuviduvabutadoramuguj.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2b47256c40048521bfa54bb75a6527a1/kasagavam.pdfIn PDF document text
    • https://aokman-drive.com/d/files/vazokamebu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6052bd99a8405a801c722b9e07811be8/12533515305.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fapuwomol.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5dc8b9ec---37100584972.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/55984764987.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d80c2766---53130686984.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df6003304e---fewimive.pdfIn PDF document text
    • http://wernitznigg.at/files/43002597134.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/kivale.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/75340774403.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/mirexekudifa.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jakafofurojamofomiwulot.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/tatulijixilukagaf.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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 11024 bytes
SHA-256: 8c98a6c38ce17cc03293b76894d9315d60343990f512b25057f8bd609a095c67
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 18408 bytes
SHA-256: bd48109ffc7203ef6cbbc7bdb4ab5f9ce1fb1743490562df4bf47ae0ec8a89b6
font_02_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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