Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcaf00eb1e9d4a4…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 01:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b954d2525ff5d8af2d97595c6fbc6421 SHA-1: 03b445d038e4224688af61882ad80556e0abbee7 SHA-256: 3fcaf00eb1e9d4a4cc51e39e372ef69f2d19506bf865c0fdfa1a636ecc04fb19
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is part of an SEO poisoning or link farm attack, likely intended to redirect users to malicious content or phishing pages. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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://chcial.ru/uplcv?utm_term=padma+grahadurai+novels+online+reading
    • https://processwork.archerhuang.com/ConImg/files/31409320099.pdf
    • http://lgassociates.in/uploads/pidinaporepifugodomisaxo.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ef9f526dd8795e2f94d978b4ba90922a/9035687382.pdf
    • http://patanamachine.com/imgUpload/files/11447396291.pdf
    • http://flyingwedge.com/uploads/assets/file/turapoxutatejukazojo.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362cae524b8---69775108922.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7da7289f---mipemuzona.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b5a0920dce24d9a6ca772e3488b9441f/jonebovagomaziwasogakuvi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615009c96257c---16661774450.pdf
    • http://vxclouds.com/userfiles/file/1280258474.pdf
    • https://globalmediaminds.com/uploads/files/rabujerijetozexu.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/81545676480.pdf
    • http://tjsyjdq.com/v15/Upload/file/2021922253536824.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613922af43b1a---52387203634.pdf
    • http://th-hl.com///upload/files/kufowudizomufede.pdf
    • https://yauspeshen.com/ckfinder/userfiles/files/93853079979.pdf
    • http://xszhuhai.com/uploadfiles/files/birapeketewo.pdf
    • https://best-label.com/upload/files/73874532021.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/vujasarilevugaj.pdf
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/donusazokelopen.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b63e.bin
fb4b19c717de4bbbf5d792beb88e3203121a6eeed6aa01a476d89ccf5116db91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB63E 10764 bytes
font_01_sfnt_off0000ce96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 16792 bytes
font_02_sfnt_off0000e6a8.bin
7b6983667d23b8f35d00dacbfc22f8785de365b2e3e3cff0f7e4a92fc8f7beaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 19904 bytes

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