Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cbc11a46557640…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 00:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99bbf075731e0331bf8e39cee33a8e06 SHA-1: 74a892ab21891de9fc31a9a19c897679a2343d0f SHA-256: 92cbc11a465576400f564707ec319cb58cf8d98a3dca0d135cc8d3fda27de2f7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da09ed539c---59344116011.pdf In PDF document text
    • http://chandigarhdatarecovery.com/files/file/zajolulisojixurixipiza.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/86186330382.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/dojerolobiwivogogis.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/devowobawedi.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210913040930.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/90865911430.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/woselevovobaxapapapagoda.pdfIn PDF document text
    • https://fobh.net/userfiles/files/zodet.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/3200322680.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109111645028384.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5eb21d4c3---fomezawuvubebowugexibupil.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16148937c4ba60---viruro.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zadowaluguwugugufujejixeg.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/6630146011.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/85762043732.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/21619202460.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jobukukibage.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/5224543125.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c61c510c---lofujoxuroliko.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25072906647.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/59058303316.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/romep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fortnite+chapter+2+season+4+item+shop+skinsPDF 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_off0000b351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 10860 bytes
SHA-256: 18c79c573003af3bece9b0751a55a06634f365a119c0aaa8b074803886fd6926
font_02_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 15468 bytes
SHA-256: e667c23e9fc0fe79858c04bfe55c2aeeaf7ccb004ddf12833a6c8815cede63d7