Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20b4284aa8cd227…

MALICIOUS

PDF

62.6 KB Created: 2021-05-14 02:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 367b8db0d0b23eae84c09c6ae8506d22 SHA-1: a9ecbc67d32230919d82f549de29953db052b8d9 SHA-256: f20b4284aa8cd22719a9ed8aba25513a3d6767899ec2150a7234ba0912a0c38c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q4kbgcvrphn0q6qarohceo7kci/tufaravogufopilowufa.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/bbjks3p061s4fl5hda5i3ibcv3/44481473238.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/137cc4f0e40119cfd025aeda5cb68102/totozazopexade.pdf
    • http://dent-pro.cz/pic/file/pabobeduxifara.pdf
    • https://alianzatours.com/imagenes/file/zejitosi.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084140966034---pobevupebubiruf.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb106ba1b---1689753000.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e74bd37668---32222176273.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9a8a63313---kofinodenazexofazejan.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/81b89cbd4fbb5b2757637d70be4ff9e1/vazanuwuwijewenenavigizu.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606feadef2499---dagenekaga.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608912f328763---35435023262.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cfb59694e83fb25d6c15910f0b10fde7/60129314173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=elsword+elesis+class+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce90.bin
b148120bb0fe60b1b4bdba7d327b9ec7c1ec6672581c06f2acfe0c2b792fbfb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 5156 bytes

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