Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0198a0a9818d19c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 10:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4a6a9022eda5b9e3051fee7f3c559123 SHA-1: 33ef68e6e0d9ca03462b2e57fc645efc5dbccae8 SHA-256: c0198a0a9818d19ca1408dff8eb35002de0b8a099ac253936df71ba1d1a50d3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm structure, suggesting the primary purpose is to redirect users to potentially malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=circle+rate+varanasi+2018+pdf PDF link annotation
    • https://eltonltd.ru/sites/default/files/uploads/78677144481.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b28fb3b85ba---tujopifulafapezazud.pdfIn PDF document text
    • https://aneri12.cz/res/file/28592693982.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/15729332093.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d43400b2b5d93d012dde02f58eb975bc/79529708753.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70dfad5cbc---82080586214.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5289f4a6---bebulazologudavuj.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e6rdsq2vuh7c48obpsp74tujt5/wuwinuzokijumu.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097277415b2d---49713494934.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bea691777---jizofikokurinufi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8622cb721eb5fb8081c12902efc47a64/xajenipetatizi.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/45435705923.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/47265942971.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/dezikusaxuw.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/77611099774.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/048d56d7f3b319d642b0cfbd0daf3597/bunetanasosatabewe.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083cced7f0de---74499186287.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050806540473499.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/teboralisa.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae316a5c3a---lunigarebasototisatus.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/miwexojabewal.pdfIn PDF document text
    • http://texmet.pl/userimages/file/bigod.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65baa99252---pofagusuv.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/41732940489.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9bac5f6d48639fcc319bed31fe30e5e8/tovatazegidedikoxuluri.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC029 11092 bytes
SHA-256: d6d3552b40cdb8234e92148fff47d09b34edc5fab7ea9834421ca25faf913283
font_01_sfnt_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 21552 bytes
SHA-256: 3515b996d303873f8eb3ca220b5843d8bd5aa456fbcb8cb77acbb304783b3d90
font_03_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_04_sfnt_off00013d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D73 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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