Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a810ea57c150b21…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 00:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e012bdc47f5608c29c0bdea72738c689 SHA-1: 23e32554d25f2e37bea37d783d54b67df0827f2d SHA-256: 9a810ea57c150b213ce692a678a78b07419897f952ed40cff226e315fc6dc558
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=the+physical+components+of+the+computer+are+known+as PDF link annotation
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0s6dighs94pct9aogme3dki5i/fajowajezobokilukizara.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e3785f2ad7b94c9b54af322287207f3/23543330567.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/1734581429.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac682252cd0---22339025594.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/535ae46ef0675742ad49cc58f164f536/gaxatozivotitisixotuxini.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160934fd92c3f4---tapikepexajotun.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/48238123944.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160784085ed13f---puvodewali.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/90779075892.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/68944378179.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/pptt235bb3omkkvsn196ll44jh/20375672674.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/90896631751.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/10e3321ce9fc342a256a935a37e2b0ff/lopumej.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1c861a7d73b1d330d4845f6f58ffb5ee/dakoginonopitimufus.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6apolh1ghn4m9cggajg57edb70/36169513839.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ad22b16445861e228c4e827fd9a93272/bagakesapekuzimar.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/wubixoxigekibegi.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/33657345453.pdfIn PDF document text
    • http://apcmagon.com/userfiles/jinelidexamoremo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/1335636340.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea0e61936---karigowolevigovedi.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092ba7d22035---63728759643.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_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 11100 bytes
SHA-256: 595c7a9a7a2fdbc6a59d4af36ce4b4a58b2e2de156483d6e0c6967b34843cfe4
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16972 bytes
SHA-256: a77f08fd90b027a489cc98fd2215681ddf901060cc057f32f423417ddcdc2da2
font_02_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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