Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a6e628b7ab81b6…

MALICIOUS

PDF

69.9 KB Created: 2021-05-27 19:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c350bbb6c850f4ac7fc8aafcc0e099f4 SHA-1: b8596cc307aa600dd2fa57eed0bf3536648d11e0 SHA-256: 40a6e628b7ab81b6769c521b4b21ee9feefb38fac8c06070f352817b354dc5b2
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

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 http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160789e92d2b7a---85610896626.pdf In PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/v53hcciropt84bd43sf03023tj/98508249674.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/606b3e2d76d8dc4bec29306220993fe9/37478820702.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608706f8e9ae2---47339274156.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/61516867712.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe97fbb765---jufuki.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a8e1443ba1f31728ad06e287db4a7fd3/bezeribavaxosir.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/baf755833fad2b2b8f76b0156ea57f52/zojefedixemiz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ff1ad4357---49543345674.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090189be4ace---99441573773.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cba793312c---riwigu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/1339917076.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/feseni.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503110611674453.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/besolezikawipoj.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbd037631130f7ec533891c66e3785f9/zojorunuxe.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/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=effect+of+temperature+on+enzyme+activity+controlled+variablesPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 5608 bytes
SHA-256: 2855ad440e461bc991094fcd5391204b5e6d92e491636f65debca1bcbb31ae1e
font_01_sfnt_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 10684 bytes
SHA-256: edf45939af6ad3d35ae76743f204725829810c5154f1825fe96810706e967c9b