Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ca7597d6b10f2c…

MALICIOUS

PDF

78.3 KB Created: 2021-06-16 12:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: add07e0739e04169abeaea7fb7b3b24c SHA-1: 25c0cfb1e1f1a3e5139935d3b707b639e159351f SHA-256: 85ca7597d6b10f2cbe6aa320e432de31970a068096041f620c73b923a9fbe903
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://archism.ru/uplcv?utm_term=easy+yoga+step PDF link annotation
    • https://nhaccugiare24h.com/uploads/userfiles/file/lagumukusenelibukuli.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609860866b7d9---jigig.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xirirulalixuxilajunotomog.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/13642128849.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/20633885817.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/rovekutud.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/nakegewoxegolixufoj.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e3d156e862fb7e57643f2e20ca084810/4927828756.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/witanidemepexen.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/9risql46s1kfj8cdrugc4121df/palizaluribopujaviwasire.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/jekozezazafusanukabege.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a85267025a2---27181833969.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/87f14a6860d3ffbbaf58150021655195/1085790413.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd116c94a6---fipefezelemegubomivafuno.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/reginabipamivademotatope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 4916 bytes
SHA-256: 2300c3780459671a1e0516fa1eca938e4d584cea1daeed6052aaf212346b8a29
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 10388 bytes
SHA-256: 3007fc6f3ab5ec7c184f7506dfce41683cf04f3063fee50887568a9a86f86040

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