Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34bedec1857d457…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 04:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 974528a753defe03dec8aac0ef9dafe1 SHA-1: 2e7c407af8700568e4266386242f4dbedbfa2de1 SHA-256: c34bedec1857d45715a5b3d9c1947f6a65339fbc183db1d16df52cffe9fad451
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://giasuthanhdat.vn/Images_upload/files/volemirakujopide.pdf In PDF document text
    • https://costabravas.com/uploads/localidades/files/vojanipa.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/doxozesaperipomer.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nanoxaribolewefegowu.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/vuwinulekerutojalosan.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/pejewobovixativovi.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/lifewuriberufiluniwotogow.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/vikosow.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613240bab8863---82500245318.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/24928603323.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/muzutup.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3032402678.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sobotulijoxavezogi.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/31309050349.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/demavisererubokoxusuloda.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202199922258715.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/14g395cu2bb9avmjl46d5ebkt6/fituketelulazenubanaku.pdfIn PDF document text
    • https://defi128.com/userfiles/files/rabiboz.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/0036248a381c3fff67cac62d535e3300/28839829149.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/67236941247.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/sitapunukaxa.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/gogawejamekoka.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4e02ee82---zutedepozofuxara.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/1381175797.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/walijajuxetaf.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/vigaregipenupeluno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+update+for+nexus+6pPDF 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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 10796 bytes
SHA-256: 1c9d6e0956b38f7f1d984cd46ffa95dcb056d1432e4e2883aaa392eb4e06969b
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 18696 bytes
SHA-256: 4cc93852b784489d7a1cc11817476f275c003967ba24e50621f07cd5a56567d4
font_02_sfnt_off00012437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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