Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49793544ba59760…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 22:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b41398ff9b6439e125dd27e3736bf98d SHA-1: 5a7bfc2496718d8ad6b00ec28e2ab56c0c62d7db SHA-256: c49793544ba59760c95d2f441690b1021a178adcee6424952230585178d2ad87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to direct users to external sites, potentially for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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=virgilio+pi%C3%B1era+libros+pdf PDF link annotation
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/939a360ea284c6feb262c40735ceee90/vanebiwefarilazegebebukab.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081765e53a38---xubotimiteg.pdfIn PDF document text
    • https://maclashoes.it/file/bonik.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/zutifuzinoj.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/xevupuzodosisurazelifo.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6197c904e13a560372b78e2ab9550817/nuvedutupunorunusewupija.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/20994101270.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e99f350bc---41076861127.pdfIn PDF document text
    • http://dakmet.pl/upload/lodewuvo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k4givv4i5p31rf63u5p97rcrs0/vaxonilulote.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/lefutofal.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/kopeton.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb3f59c64---11893383952.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/rinimelafobogerakusa.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bace50e687c---tiwibilaxad.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/36224896775.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8e5fb6962---lajuwumituparu.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/mezutaxepixoso.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/76094758165.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/43293186061.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/54644754610.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/50673532600.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/71897909640.pdfIn PDF document text
    • http://modern-pro.ru/files/file/65416529907.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932c64b6b70---wasakubutizamapilusam.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/kidaxubimagagizo.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_off0000c08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A5 10788 bytes
SHA-256: 56377a4743aea88f363ef7bc9cb8ee945294a16805f267a4481e0203268d595f
font_02_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 18404 bytes
SHA-256: 89c1886621e229177a2b145d8d88bf1f6931f8aa41cada17150bbfbd5228c434