Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2b834875e6033e…

MALICIOUS

PDF

93.7 KB Created: 2021-06-27 07:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9c31a1f7f8dd7aa741de7f3c7973c24 SHA-1: ee93d8c694b95082675619275c39f2da720d7a5f SHA-256: 8d2b834875e6033e88f2cf291d67d9fa9ce159c073c18a9825e601210c7bafdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=dangerous+spider+in+the+world
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec6f15578---15876826792.pdf
    • http://grupophi.es/uploads/files/jenawajujerivufi.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec052b12909cbdef1aa739d22df275a7/susuposoxajipa.pdf
    • http://mamnonlittlesun.com/upload/files/26018712449.pdf
    • http://gyorszol.hu/userfiles/file/kezizonuju.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bd0f2709826243599669c2ef389811b3/bapupepezodur.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a2a1c539bdbf01421d924e8435a999c9/fevisekuraz.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/276m49cg9pi11p0grg81oq54pb/babobatusuwep.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vko1d5pq1rnrcs98g6f3hikf0r/fanedulalu.pdf
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/kuborufe.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6b6aa43ba4df9ec1fa59004f6fcc862/27301857478.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/fbf947961a384c685a8009f84c795d94/pomazumijenujuxagonugi.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/18db69cd9779f533629989eac96621ce/tafogijojap.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4be52b7101---xetumeb.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/r41ftr5rvs9htiobe7uv6p4aqt/67599517580.pdf
    • http://www.jindatunnel.com/up_files/file/sikudodemitekekogov.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/651045487e3254e7d8b3f43c2235d85e/lowiwaralelijigafore.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/20485741109.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/59c074f38fad3b38c91a17a3e47f6b2a/18726542493.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f2fe8fc3a---26127026852.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2cdb6d81---guraraboxixurisid.pdf
    • http://alexhofford.com/temp/files/file/kovapabuwukipupagepobisug.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_off00010b5e.bin
51125f23d60fc07b9f0d6601f109bd369047efa7561530e7923e1723754fa205		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 10860 bytes
font_01_sfnt_off00012436.bin
1083927bb50cd0e051e38a49b6546563950d7893254e1eeae2b525fa64b4c725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12436 17272 bytes
font_02_sfnt_off000151c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151C7 16792 bytes

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