Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36fe90fae2be7c1…

MALICIOUS

PDF

73.4 KB Created: 2021-09-30 13:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 759304fa4733e251412c9811b177b2b6 SHA-1: f1f5bc9bb347a4dd93dc5ef1ea4baa0f82f6a127 SHA-256: c36fe90fae2be7c1415cb5fba1108c71e4288f8d1c67ced76c178dae96c606cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://solidpractise.com/files/userfiles/file/tibagogazopesewaxibitanot.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2lp7kvv7mfonmve1sqv90kn4j2/gofilat.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9ea7495c---xupozudifolojadesake.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/72286354374.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/30018662660.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/dofixanofakit.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/11702158612.pdfIn PDF document text
    • http://cwesp.biz/upload/file/34012512934.pdfIn PDF document text
    • http://dominant.name/userfiles/file/91882123810.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/xofefipesenigoxeboz.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7cbaa9ec8---tunowovebozoxim.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/96815177790.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/ruwufizirofegiluwafofa.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/mavajajigamovadu.pdfIn PDF document text
    • http://reylab.com/userfiles/file/giritidoduzokogidus.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/fazobebelolafudetaronopiz.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/72756794638.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/70034702538.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/82461585209.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/45978434188.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/97696612881.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dipojelefusepezegi.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/suwofefikapar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=asees+full+punjabi+movie+downloadPDF 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_off0000b95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95C 10964 bytes
SHA-256: d685c2bad27db7d2e2734e9c1ed7cb5f48772823d75f9a2ebd5a69775e8a13b7
font_01_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 17700 bytes
SHA-256: 0246c739d47a3103c9015b918bf32d6dc79248784418f8a196821107c167d9ef