Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6384ee512a9b79e…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 01:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31a7cba5cce9a38d11cd9f4292ae8a02 SHA-1: 7d2bc591c31446a9304b3ea2d5bb75ea29b128a2 SHA-256: c6384ee512a9b79ea28532451ad3d406df41aa0958d3ad50a19f9c7f20fc85c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary goal appears to be directing users to external content, likely for phishing or SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://dancedynamicsla.com/clients/38740/File/zumobaw.pdf In PDF document text
    • https://anukulagrotech.com/userfiles/file/rotodixilejojila.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/61684721878.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/45572781802.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/tisigukowenidinavifilano.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-18/20210618073227320719.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/39565586962.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/138d93be54654efe01d70762b144d6bb/bekadizutizateralava.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/77b41f9cb6df9b71b2f9080c9b482358/62108353754.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/nikojotisabolax.pdfIn PDF document text
    • http://rafaelokazakov.com/file/45854617230.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/1684000200.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/miwinufamolepimito.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/9583551563.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c09d54ff46---28538043488.pdfIn PDF document text
    • http://precisao.net/files/files/30084735774.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/66327397270.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/49bb2c60878089f1500cb06cc1c95d96/4109420369.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/7682147633.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/73924622146.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/43030611555.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af696322160---20553739253.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f9ebe0399---65751920803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stories+for+adults+with+moral+lesson+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_off0000eaf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF1 11024 bytes
SHA-256: 6775d0eec4a9ff047cc8f66d579407dff09e60ff1e9784d598be1c068b938c21
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7E 17284 bytes
SHA-256: 2d66b568531c023a51726d27ec7a410db8f1b3530732a86771df850702504da8

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