Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde582749f2c283d…

MALICIOUS

PDF

79.3 KB Created: 2021-07-14 00:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0829fa231da961f29ca115785f48117 SHA-1: 0030372aadbc0103aef4a65c59e9f123d1225fbd SHA-256: bde582749f2c283d2bd11a4e9291c262ba5dab16673a437dc17e84b256d45398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to various websites, some of which are identified as compromised CMS uploads or part of a link farm on disposable hosting, further suggests a malicious intent. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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 http://geopraxis.it/userfiles/files/90676061318.pdf In PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/87294322449.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/20957808000.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jujavuwukozuf.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/40cad92723c4bda48dde25dcf5683348/15452169653.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/88534771213.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/in3mh92t8hdao5pdqdrov1r8m7/nofanobirex.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/82712552342.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/jozafenijo.pdfIn PDF document text
    • https://digireg.pl/upload/tatirexunalosifu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/0579c9273ec01ea592af0b9ff0600966/lokab.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37edfc99c1---91806677213.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079420aab6c5---72057212031.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8e1a7332e8f68c9d56e2150159ebdf65/72027685628.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2cbibmsofnegp3jqg4fsckrfdo/vemikinavo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/90053572390.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/10057380047.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/36437607057.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/fatofoke.pdfIn PDF document text
    • http://prograsifkalip.com/files/denajotijekefit.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7465b4ec3efe3ed6cad78e5d8e39af0b/wevelijupebabogoboguzo.pdfIn PDF document text
    • http://yoron.net/up/files/fojugusikofumujub.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dc2e529dd4be50653f9ac8299f3561a/13422732348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=learners+test+questions+and+answers+2020+south+africaPDF 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_off0000d149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD149 16672 bytes
SHA-256: 8151e64c048481afc55cf8d71814544c7456d42e47e54b2a12b5e72111b2ac0e
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 11060 bytes
SHA-256: fe6967e2121fd8ff4a4be8f1f9c029d0b283dc1b87a288c0a65666849297401c
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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