Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdfbe79804d226b…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 09:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75cc325037b83779ab3308f34d0e17e3 SHA-1: 889c3908fc2c881114526b93766f824658c06f66 SHA-256: 3fdfbe79804d226ba37f84ce07a0a300a52033fcd85e495380de04d081041c95
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://oniceh.ru/uplcv?utm_term=country+line+dance+step+sheet
    • http://liddellgaryfamily.com/clients/863293/File/9285312178.pdf
    • http://mesterek.net/tmp/gafigomopikeside.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df7950bd231bfd42f35652972f92d4f6/zojefawunuxim.pdf
    • http://zge-led.com/luodan/images/userfiles/file/13516114027.pdf
    • http://resetimpianti.it/reset/public/file/46448226527.pdf
    • http://portalcom-b2b.es/img/user///file/_0847358001619973877.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3349de2710---9332857780.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609254dd9833b---rabolubexevefaludit.pdf
    • http://grupophi.es/uploads/files/23433539853.pdf
    • http://zhengfutz.com/v15/Upload/file/20215291728183789.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/377c4886d4762016009b047df6df64e7/wewawenopofavedudebir.pdf
    • https://samtee.com/admin/images/file/29043826951.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b4405f1b---65807639549.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/fazujozuno.pdf
    • http://dlikefulproductions.com/clients/875850/File/senajef.pdf
    • https://nadinerogger.ch/userfiles/files/wevuse.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac456da6386---28648721065.pdf
    • https://narimasu-chintai.net/jcfiles/file/pazebopijevenixotoruga.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/3gm66o5850p2f2pb6426k11v17/72391929501.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc959540980---wozusutorosuzem.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af5cf3aafa6---29227569913.pdf
    • http://americanewbie.com/userfiles/file/90924042943.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/af647c7c6f75604f295039242d634c5e/wejajigevusejanisez.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin
7ae5b419cd2003f32de79e1d65db5be10084e181b500f312c30400c0260ad0d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 2088 bytes
font_01_sfnt_off0000f97b.bin
8d4198bc468179d0e3007028559f77b2915599a20aeb3a5f3c515813ea1acb84
pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 10856 bytes
font_02_sfnt_off00011287.bin
b0c922ff155f07feda360b1e4c83589e73f29345e70ded4eaecd4032174941c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 18216 bytes
font_03_sfnt_off0001420c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1420C 16792 bytes