Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c91e42289e79b2…

MALICIOUS

PDF

87.0 KB Created: 2021-08-10 21:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd641d570df88ed5f3ad6201011287ea SHA-1: 759453e345a24c456d4663ae8667be33a5a751ec SHA-256: 98c91e42289e79b24ce4655c462a16d7aa6418019d011c3c745a6dfa6287b2ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to potentially compromised or disposable hosting sites, combined with the ML classifier's high confidence, indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://syuncyoku.jp/upload/file/54113275842.pdf In PDF document text
    • https://synodradomski.pl/userfiles/file/49074124780.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ace5or9fruiodtb42otovpcfs2/76795062614.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/64173679895.pdfIn PDF document text
    • http://rc-modeller.se/images/file///paxemozerige.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d83e1029d---dojeduwavojofutuf.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/tloptgvl5o3tl1ucpgo0bta69j/gulelofibefipu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/furafememekugawukupuva.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/xiwigezu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7190c6a9d---xoxikugimafasase.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/47156508890.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/xutaveboge.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/xoletu.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4cad4535b---4308808766.pdfIn PDF document text
    • https://campermagazine.tv/public/file/pawigisuno.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/edcc8fce9a4cae2a4332da511422f13e/80146338239.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/357fc19fb39a3b93bdd9e794cdf227c6/76924692686.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/14754447600.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160efecf64ec76---54337450316.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9820205d95---40090078580.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/nirufijuvazobil.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106122310343486.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4e7be87ee8c5be8e2dcc9fcfcc825b08/rapipib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=modelo+de+administracion+por+valores+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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 17420 bytes
SHA-256: c0f107ff362d84492e0fad4a61cafdfaff322cef17c2820ffa790fc8dd4b7269
font_02_sfnt_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 10840 bytes
SHA-256: 5e075cf5cf349238a1a01320e171b7b68a6febd546acbf519f2d0053ccb43f2b

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