Malicious PDF — malware analysis report

Static analysis result for SHA-256 c102167367360aed…

MALICIOUS

PDF

95.0 KB Created: 2021-06-09 00:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d658765fd8a92b96b9859cb601ae5e1a SHA-1: 704f7b2f1be4b26c582d9a7f3d09efc0c4eafc8d SHA-256: c102167367360aed31f3aa7fdf2530e1805733ecb6d04ed70b23dfe15bcefd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=followers+100+gratis PDF link annotation
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/89488fce3642337d94d603e74e51a63e/kunudonu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kizugiwaxunejigomurefe.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4dbba4be---13988000707.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/63adqqjgetkcbpf63dsnml5rd1/vetefunufa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfded7485ff---mobewub.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098717b0dc1c---voberik.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/bb6d674e412e85649d2c7db07af50ac3/91472621114.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd4d88b8e---47816888626.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca6e928eb---muzebatebapux.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/51571242698.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/km7q5h5fvas91itpj0bmh41tm6/52405621248.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f8391606b6f0f7969eab2e8810451e21/sodaroxaniberamo.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6hb7r2pvfodm35rjq6qg8oniqv/7420011745.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607deee3c5b40---60340180122.pdfIn PDF document text
    • https://daismene.it/file/riwiwewavozosujagem.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5df3s1q0dpch9rg4u8o76e16h2/21150369735.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/82959418116.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D47 5096 bytes
SHA-256: f905020b473284deb6c13bae6d0f181dc9d262499b5ceb7a3f1ffb133949f526
font_01_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 3804 bytes
SHA-256: b51731b176d45db7fdace41df08baa6997394076e45b552382fa7e46ef983f42
font_02_sfnt_off00012d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 13344 bytes
SHA-256: cb29e9d89065e8713c336c70deea26c3ce6ed78f0ee2160975ac55478089df2b
font_03_sfnt_off000156b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B6 16664 bytes
SHA-256: f2b1b20127bab295aad51748b7aeb9e9473fd76004299df039f8d24f47f24454

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