Malicious PDF — malware analysis report

Static analysis result for SHA-256 18127e78349a399e…

MALICIOUS

PDF

79.1 KB Created: 2021-06-24 04:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d316317bfa2d7036983ab33f7444805d SHA-1: f68a15723cdc01acdc4c9196e128787dd16062a7 SHA-256: 18127e78349a399e37c3a4cf87362e34b5048e377bf77ccad37411e0a9abb46c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF structure indicate an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://adasms.fr/userfiles/file/58693867061.pdf In PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/s12a1us8abbgl45546icq9vm3v/sunozogunefogud.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5c2b6433---gitebaniv.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/94266938375.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/niruvabulofaridozute.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94a56f6cb---kabajugokeninuwufewegiteg.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/39b43aff7b4fe7ea39d1622d1f25e833/vuxogamiwiwotinilolifunip.pdfIn PDF document text
    • http://fitviewer.biz/files/file/17701884411.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/wefokitanunapojovibotuzi.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/silazofuxakedagegarurex.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/telafilufujisifubena.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/9cc3b753f872cf53a2b24e74d94fdf31/gefixugufi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609102e8f339f---69972135680.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/90288450315.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c0221877a4c8a830c4ce3698a51ffa6/86538498964.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a7ba00b0c1bb7932bb88e994705f46d6/48884642221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+win+an+argument+everytime+book+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 5572 bytes
SHA-256: b7d6bcf4d10175caffabb9bdf22af5a82f6cd69150b639446f594a91d92aadc3
font_01_sfnt_off000108e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E6 10840 bytes
SHA-256: 5fef1f66a7114e811f0c16802ef0af03feb32d54762137fc58563a02562085be