Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0d51fc79cd860e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 21:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e4e12308ccaf95d84875b917b11802bf SHA-1: 18a8e58174d9496d5ae5700f09e2305860510cc7 SHA-256: fe0d51fc79cd860e1bba67c09aeff687bce8edb2f959501088fa9ebfd5acd316
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the linked domains suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=the+crew+download+apk PDF link annotation
    • http://partnercable.com/files/55746390392.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/49085666904.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/jonajuzafusozegigadofimo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145179287d37---18015761703.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/duwogovuv.pdfIn PDF document text
    • https://fishuntpesca.it/file/rugigijajan.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/14059778098.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8b566aa1---derexasuwagijatagiguwupoj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/gikiwolaxil.pdfIn PDF document text
    • http://hk-keber.de/images/file/5897351757.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/lawosilufasokimu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146dc65b54b3---50538073693.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6821165838.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/katisatodavujopo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/24847039883.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/16331639302.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/mabidazaxotibu.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/63114586627.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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 18396 bytes
SHA-256: 5b95b46395d5a68f649d47d0a12d85d37e493652d18bf5338502215bd85c8181
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10392 bytes
SHA-256: dfdaa0112a48d860fa96dc8c2a6342e2cdcf41cfe0b9cda1d94c7451137cc5e7
font_02_sfnt_off00012003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1