Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ce5fae13ab2548…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 15:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c309e73b52e286e0cc47b812e41da1e SHA-1: 003dee2476ed6f8306430a12d98f28e2c9a388d1 SHA-256: 31ce5fae13ab2548c9edc22355026135ea74f0016f42579d508d7391c9936d48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised websites or disposable domains. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a pattern of using compromised or low-reputation hosting for link farms. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=pdf+to+dxf+file+converter PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/44831887297.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/2280714018.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/sumizijujejipogetoleru.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6546ef53aa36af8c03567779fa0af3e8/12138988147.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2b832e2c417de522cbc65bd1b694a5c2/76193715368.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/27873300605.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad565e3b18---98497626848.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/xekof.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/gosetizu.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/20639847646.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/25627207021.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/24394485950.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/rupubaneruvipalipusajojaf.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/21097641618.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/46413331353.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gexigakekepewodo.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/felotefol.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/91888372882.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/58918668516.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/87069070464.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16153ac9456050---zogitovi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f10193ba3f---tigedomirepajuginaw.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/31503274940.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u7sho62b356bpduc5dv5ctip6a/48634674747.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_off0000b112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB112 10308 bytes
SHA-256: 4c41e4cf84825d5a36f0a8ab8f83a4a9ab074f83033b9f46718b6d57abdb3253
font_01_sfnt_off0000c862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC862 16572 bytes
SHA-256: 47fc1ea3b71f5be1d5bd9f49c05d0983874debaf96ec21b1299e73ead31fb51d
font_02_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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