Malicious PDF — malware analysis report

Static analysis result for SHA-256 b196a268e9a5a15d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 03:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 006d20b8f9a5e7822067a103c1ba9269 SHA-1: 034ea42fc3b73d7d12e35355e58bb1efc6bc7a36 SHA-256: b196a268e9a5a15d395c46ea3d521715356fa27e355a2b799a8fa12ad417b500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.plan.msu.ac.th/ckfinder/userfiles/files/vojujifumiwupabesikubex.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/502d9352c146d5fef336551483f49787/73161380348.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/jekezexekogira.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/robekimot.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/misuvejakomeritop.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/21866151755.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069019814b---juwulowanulenuted.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/batijadozijetaxemew.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34351630416.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/puzimoboxodofeje.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/zisakutidebifivelulivut.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/45280714734.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136269c89873---nakimikusutuviji.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/genosuk.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zebami.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/bunebezejipevavilor.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/61633639023.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/89597484669.pdfIn PDF document text
    • https://avenue102.com/uploads/file/52056210617.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/86946337645.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109010224494631.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/29507990897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+free+download+tabletPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10520 bytes
SHA-256: 56cc7338caa5d908e540be905ad46b4e32fc685df49df8404ae2fd8b5c77abff
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16672 bytes
SHA-256: 42680afdb6c95725d27bf5fa226233dfc932955a1b3fdab8f4fa5b7f33fb5a3d
font_02_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1