Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4801763ac9eedef…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 00:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cacab7c2c945360a397bf3b9f1cdb280 SHA-1: 4272832b5d88187ab5fa5b17935ebe0f992f7c2a SHA-256: a4801763ac9eedefccf9dc2f1e3cf031a1382f9d5b4e1d1c7e341666ea2e2737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document may be disguised as an invoice or payment request to encourage clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://unseenadventure.com/userfiles/file/38976593596.pdf In PDF document text
    • https://umartravel.com/files/bekunumixef.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/873e5138b578a2308fa24b16a623e4a8/tujig.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/9674501171.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084c9c04ff24---77979785219.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e6232a099ca796fb8a57c34e68919e08/25911779183.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/95750744704.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vuson.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/sozitijemewapokolifu.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/pasoreledusadonaz.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/i4bl1jkqe2qvi7cubi8hqbvcmh/gagafirajajibasof.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b1054c89837bc1bd2c685c682cf7680d/46220320533.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/darinepabijorezutu.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/3429934470.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/29528825610.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/pdmelvh98cf8k25pdho4jgcmf1/83689120107.pdfIn PDF document text
    • http://avgdesign.com/userfiles/file/narugojiperofatevugen.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/222b445d5d3c0cfe018f5410b1e219f6/6273540328.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/kiwaroketozunifizaru.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/diwerawujitiwexarazeji.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/52853295761.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26786964569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sovereign+debt+crisis+pdfPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 10868 bytes
SHA-256: 6163242f9db1f16a955702493b0eeb4215ca52e9ef0607fb243f91ac8354c164
font_01_sfnt_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 17556 bytes
SHA-256: bf61e4ccdef51b550ad12f28ce7e22454d45c2b02ceae9c987e9312a1e09ffa8

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