Malicious PDF — malware analysis report

Static analysis result for SHA-256 746ac74741b7689b…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 00:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90a5fc5f3857e101bb7ff636257299fc SHA-1: 87363b7cc7ccf7b2b575473b2a48e89a40b2f36e SHA-256: 746ac74741b7689b298964f23adf0734ce79cac5f23662e8e57612beae4dd148
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=can+mike+tyson+still+fight PDF link annotation
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/dupar.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/38275820462.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/47372720529.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/66410323469.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/vupaxev.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/mopupabu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161402e685fabb---29458657018.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45157521575.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/80894323859.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146380460b3e---pobanagozunagejosinu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/0pt6ml8mrh1adf181rj6umd4g1/74640537270.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614faba2ed104---sozezajubovabomadowizapa.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/vufux.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210907080115.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/54514230464.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/2059016626.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_170155.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/pemit.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/6491972328.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/35928414868.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/91745410395.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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 10796 bytes
SHA-256: 15445f3e411c1aeffe20a058c1caaf5a4aa5bdb586f2e743fe3bf155f2c8e752
font_01_sfnt_off0000c7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 15776 bytes
SHA-256: 6e226f72561c4a09ce5d91a7ce07e07b30e57147716c1d32144f7dc68fe3716e