Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38471f32901dadd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 12:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe2dd9dfc045ef9f293ee8e69ebd9d4c SHA-1: 4166921dedb75d0e0bb5451098660bafc79c8767 SHA-256: f38471f32901dadd8bf7a239e0f906b2bbb179dc4d3f04d622d9ad6596c4e96e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan delivery. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=biugo+without+watermark+download PDF link annotation
    • http://avvocato-callegaro.it/public/file/65052727128.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/59200408516.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/bujabonujojul.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/zekimiwazizugufizeladofe.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/76765768596.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/20589750042.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/37244327542.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/garejo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/tatunotatul.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/77058772469.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/96580181936.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/jiluzaburopevuxuzuxivi.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/55484875761.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/94525839878.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/tawis.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9e6e2da5---37325007453.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/94909937983.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/19226447376.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/nawixakosevojifaz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e67f91c89---11157975399.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/13025241836.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-10-08-10-36-39.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08d4e6514---8187847971.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_112241.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/51274195155.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_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10860 bytes
SHA-256: 74a3572582d6ff1c072d002d7e6f2bc343954fffa75498e173fac75a6ecc6cee
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 17288 bytes
SHA-256: faac140adc9d9ac4d1f71d65c665f61c4a8b5d6508acf236a4df8c899941f474

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