Malicious PDF — malware analysis report

Static analysis result for SHA-256 df64d99bc062a3f1…

MALICIOUS

PDF

72.7 KB Created: 2021-10-04 12:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 491a69eac3258d507cd19237a4bdcd5e SHA-1: 3e4306f0c42fb64e21afcc0da86d52489a3d74c5 SHA-256: df64d99bc062a3f1d3782bd8aeff14579304cdd9d868a9ae41fbf34ce559f443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=lead+me+lord PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3ecc78318---92500658251.pdfIn PDF document text
    • https://menu2uplus.com/images/file/kibopajuvid.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dogowekejazaxogigumazi.pdfIn PDF document text
    • http://masonhn.com/d/files/jepigofilifusalux.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907125512.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12204721e---99410248918.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/71981875898.pdfIn PDF document text
    • http://diepdoanhmetals.com/media/ftp/file/poxudipomusawivigatebo.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109240805233491.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/xofibefenudusutafajel.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/xolovo.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/88609919475.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/6977932784.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/85ab08f75810d310161911cf375fd2e6/73898039462.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/redones.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ruburolikunudodagozir.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/34450961163.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/86759120420.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/medajujigutu.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/wemabimedowakoxol.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e016809b1c---nobolasili.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_off0000bb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB90 9904 bytes
SHA-256: a19ef850c278c321da33b2e110cc33580c89b0c0df0e522179d60313162dbd58
font_01_sfnt_off0000d150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD150 17272 bytes
SHA-256: 91710dfec8ba2d4330fbcfd89044bc188be7d6328c730d31465b76fa5eecad1c
font_02_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1