Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ed14a2e85f8768…

MALICIOUS

PDF

91.9 KB Created: 2021-07-02 19:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b845417b93d25e4ecadfe32b0bdcf123 SHA-1: b1bf96d90da508ec86bb9a1d1c83679fb27853ad SHA-256: c6ed14a2e85f876872d2bd9a12e44992b23b511581ec71de2a85c62dddd659a3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160960a7719d7a---65623019871.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ore38litp0dmc5ml54641arctq/41642097887.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/wegevetuzetamazofenaz.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160830afcc1e0d---xapedorosemexifafadefexar.pdf
    • https://mayurherbal.com/userfiles/file/bomupunubalif.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/vixagaka.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/9c8efe5090b13f409752bd98d56109a3/bumozazewaz.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a889fb5a82---pekaforag.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075f61b92850---kuxekugubetibiregototat.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c351a08d92d---lepofizamosuk.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/61313a2vikbt3f0mdhofct0c13/monezitujitiwizozako.pdf
    • https://matskaren.se/anvandarbilder/203/files/49207722625.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd9caaf15a---35567176562.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ec9aa57c---99637695977.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/2d95aac603ecba265f592b15ff415b9b/11524773785.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/abc85d8505a52a9150585383e9d698da/7091398389.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e26a231eee---nevejo.pdf
    • http://adbuilder.at/ckfinder/userfiles/files/mapevujewetogiwub.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9kh616vmj0pn60mpdmdmhf2r95/48214245169.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087617e3c6bd---19308484852.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/kilupuz.pdf
    • http://birnagarcollege.in/userfiles/file/tafimaguwogatijefe.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/604f6e7044394591523b3f75f1d4f935/duxetavuperekojojako.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=shadow+fight+hacked+mod+apk
    • 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_off000100a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 16792 bytes
font_01_sfnt_off000118bc.bin
6f350b9b42e95c5cb34326f5943ab25b80f74e31bc54ab0bcb43ae5e496d2918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 10900 bytes
font_02_sfnt_off000131dd.bin
e07a03f5163e77be4d45e558eb34c7ecd3032d88670004c49911ae4a62c271a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131DD 19180 bytes

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