Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c13c2c0248e3d5…

MALICIOUS

PDF

79.5 KB Created: 2021-08-21 23:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c57d7d6609fd94e4eb8a0290079cc8b4 SHA-1: 348b6d73b7807069552f3049ab47f41fe6e6dabf SHA-256: f8c13c2c0248e3d5cd67284a713c17b2cf95afdb5280c8d09d9c106d850529c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a link farm for malicious redirection. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3970355943---83054568389.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8f30304c54a4ec86ae91537b353924e7/85962013805.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/29310916508.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/6411438959.pdfIn PDF document text
    • http://allycatering.com/userfiles/5011897767.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/medavexegovime.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/96433690498.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/tofotonowamaj.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/69917812385.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ccc372859faf79032567e48f0a7eef8f/tuwobami.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/suvexufusokebaka.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01fe6c0175---daxanaribowunir.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/52427131132.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a3460a0---vaforefefipajabadojoniku.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/90293421432.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/54301434708.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bc5fb21b97c384611e4d5dd1b9c1e907/tefokonijetofoloxubebe.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e3eba3e9---mavolejusikurete.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/d6b50538c09990ac4464b57b7f0d4f04/pefexi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e52b65ec90b---kotin.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/ribila.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/31347022850.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/duekkio9q7edjqhlqscud5e95f/tosojixiwegunibabevujajew.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182ae365600---30759466330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=traductor+de+libros+pdf+de+ingles+a+espa%C3%B1ol+gratisPDF 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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 17644 bytes
SHA-256: d3ccbc76c188e84ec9ac75a6d5f25355886b6ba88de2dbf251dbf66ec4262486
font_01_sfnt_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 11204 bytes
SHA-256: 448deffbee8743f0012abcac157fc8ed62366ede5d80077c340dab78d641367d

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