Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cef785c34d8163b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 17:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa062c7e5060699bf87d80bd412d61ca SHA-1: 7076f19eb04e4a5076385c8e275d7390f8034438 SHA-256: 1cef785c34d8163bb0e3fd659f2eb2bcb34df23093046a60123d1021a566ebe2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=javascript+web+development+pdf PDF link annotation
    • http://daegyung.kr/userfiles/file/20210903093050.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f7d3b6fce67276889c0b297c9577d947/72960595911.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/9adbaf1c557b4a58b6af4e920fc3becd/39714463985.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/9312091602.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/xoresefovekovavo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138806cdeee5---28771973396.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/33471086557.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/lujujibazake.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/sepegivaz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fec5ba8e113b9041afe153c6ce63d086/17790541207.pdfIn PDF document text
    • http://dasbluemchen.com/ziwidimebujigubokedo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5q2bqdt2o4qjaqkp5qkmo2a7n9/33555299262.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74270473574.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/151737042383.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/99495047126.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/misubagikizaguleni.pdfIn PDF document text
    • http://muszempilla.com/files/file/2264745129.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/govegedenugovubegabugur.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/63049542518.pdfIn PDF document text
    • http://wohntraumgmbh.at/75403462281.pdfIn PDF document text
    • http://skupka54.ru/upload/m/22283773468.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/66182900753.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/daxen.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/lerug.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_off0000d8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 11064 bytes
SHA-256: a952d400d8e6613e46c82d6c485e00db4e98a84d47a341c048b0a07233fc96ae
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 16408 bytes
SHA-256: a4dcbd724fb475affa8531064d751bffd94457429755fd5cc89b164127d2b43a