Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68420d0abee93b9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 05:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b95706ac1842f25f1a6202cd3e5a2f9b SHA-1: 94c2ccf0350429216153a4aac32fc7da97911cf4 SHA-256: c68420d0abee93b91e76536c2a2bc1945b42d14e554641131434952c921d6e69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://machnik.net/ckfinder/userfiles/files/97898378022.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pfsbhctc4b074gp52fr98ojtkk/92580192444.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/gulafufiturezakidan.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/b76e984d88dab2952df7a1e3bd54394d/zibuze.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cb57k4afbfsvgvp498r4c45lr0/46829063344.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/1tfvbjc711qbkbppbfnkrv4oq5/kelova.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108082028531096.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/86470280825.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/lavof.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feged.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/51010291606.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/zisitasogan.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/aff7d62f3f1d49e73ba9e57a3f0eb303/juwaxigatizaxulalimo.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/9992665531.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/fufol.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de861ce6962---kolakizaliralekorifim.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160906fe479f39---sutasumofegudamirubose.pdfIn PDF document text
    • http://absigorta.come/file/nejilerenunabusobi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/mosoluxojokozifolitukefo.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/21746298868.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f1b149c92---49196898184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=siracusa+principles+pdfPDF 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_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 10568 bytes
SHA-256: 81f4bb9d621bcb77808994962ac791181838f4243a6e66f10d987c8b9ce2920a
font_02_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 19900 bytes
SHA-256: 09ce8ca6d09f33d68ba208bf632f65a937aa324b27e7decb964750964b1a5aa4

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