Malicious PDF — malware analysis report

Static analysis result for SHA-256 9296334a1bf80f09…

MALICIOUS

PDF

92.1 KB Created: 2021-09-01 10:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34d5d7ff0e0a05d13167ce1e6b55e9a0 SHA-1: be3c00ae80051a52a8fbdffc89cd429f42442a70 SHA-256: 9296334a1bf80f0989f5ce1ae82859e15d7251f95c118ffbd4e08f98176b6e14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous external URIs and is structured as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to facilitate these types of attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://philabc.ru/uplcv?utm_term=he+is+not+amused PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/98510525209.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/31c31ae8371dca675d0429dd1dacf323/2216336121.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/geforejilufa.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/xilolum.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa11f5ef8a7---nufomisat.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/58349285598.pdfIn PDF document text
    • http://webbuilders.com/files/file/jasalafudawupefilo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/lumutev.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e21fbed78---xemelobufekopise.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27ebea981---tunowibot.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/nalutaforijanusarizo.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/nogivimibasu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9cb224140---67064191267.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5dd2c2cc---14466151910.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/nigije.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca766b816c5---fifosegu.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/xupojukomezurimon.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/93973399126.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/t6j4bd634qifso4hl791ls41nk/memutepagidupafetejoriso.pdfIn PDF document text
    • https://ckmandarin.com/uploads/penoduxanijulafazabawite.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/nedubidadunimo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608568738ddb2---tosuxedobuluxenupur.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/eb35cf9c55b75811a27bbf2352f89744/85922612775.pdfIn 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://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_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 10352 bytes
SHA-256: d89a51d8de65375f9152c52c3458084f25f5435e9ed62bdb096de23e23ab7d86
font_02_sfnt_off0001367d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 17180 bytes
SHA-256: c1371cef90047cf8f2dddfbdf8116ccc5dceae2ec31759dc74f2089227561240

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