Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce518cd6b5685e9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 06:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d50012761ba39a002be07feda7a0dda SHA-1: 95b816f5de113cdd031af6440a1e647b473b1f97 SHA-256: bce518cd6b5685e9d599c21b5f1bf1d204c86f5a6526e0cf0377f1396b5c1fff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The embedded URLs suggest a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=example+of+sessile+leaf PDF link annotation
    • http://davidhammerstein.org/userfiles/file/53528003483.pdfIn PDF document text
    • https://tcremich.lu/files/files/wozofonaguvot.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/33639093376.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a271b99a638---puvuluxa.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/devazuriganagibepuxa.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/39767953784.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pedexifazepupuxu.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/53948310602.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/67493853830.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/661b5bf5b58c2ce7eb25656d608b9ed9/buxipulekukomebisaper.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/57302572730.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075895a46fe7---suwemiferosuk.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/62501995589.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/71164407457.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace54a7b5f---bilipe.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/2003145148.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/43a4e76i1989gggjbf04kbl144/91594659792.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f566f19a5cb---fitamemutov.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16128480a2c9c7---doxuluzubonogetora.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cb87dd21a---83209991999.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/77261723683.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/35885432788.pdfIn PDF document text
    • http://tfforming.ru/d/files/gifekefe.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fe2ccddf49f57f0dd0eea52f5e5ca5b9/bapuvuzala.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/61927154120.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_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 10300 bytes
SHA-256: 0eb229324c2abae46bbfa8ade49181617a87d81b81f6346d462fec43fb1e5d5e
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 17468 bytes
SHA-256: f9b84568820422a913919227fe8b75cb6b5520abf82b5cf129bef6fe642f7363
font_02_sfnt_off00012cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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