Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b63cb31a0f83c83…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 16:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5122a606eafea0b8b33f381b48c7c80f SHA-1: 1d2af88a922dc20e2a46f5049a182dea8ec0e441 SHA-256: 9b63cb31a0f83c83940a84a78afe9a1be033e4a7d9d1c5744b9de4ba097c6a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised or disposable hosting sites. The presence of these links, combined with the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=fortnite+full+version+apk PDF link annotation
    • http://jtipartner.com/ckfinder/userfiles/files/tilofipuzafe.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0b234377d---48271288914.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/16066829958.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/supovede.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cad324ad4ffb26f774a2fc2fb6e27219/25429468502.pdfIn PDF document text
    • https://masukpt1.com/contents/files/67025177900.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/79653044110.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/71338110175.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/rodazijaxeluriw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9195d9666e36502132b54fd12071e885/22963679720.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/71519714817.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/jadelozafamaz.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/ruduzebolo.pdfIn PDF document text
    • http://dr-temt.ru/images/file/zodusuritukafovesisek.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/jijanibufev.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/jitusefi.pdfIn PDF document text
    • https://nasikampung.info/contents/files/papekobixomomir.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/40344179879.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/wuvugiz.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/xefibitejuroxakovekeji.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/gizewulogudo.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/60519353882.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/45071748588.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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 17968 bytes
SHA-256: 68d39bf4dfc822a59705f1475ef75fd44fdbbd44c6fd88cee36e54906db81c84
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 10584 bytes
SHA-256: 1e1963d46bdadc48bdb2441564e060314a1348a4875841c90017cc1b598054fa