Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dab6f204cc13b7c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 08:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1e253f2b06ad2a6d04d4dc309a5c91d SHA-1: a43462585229fb0a5613c345a17d5ef9694ed002 SHA-256: 2dab6f204cc13b7c7945d950053867c8a3f73e1edbd5d8678560def9e64bc950
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure that aims to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=phonics+worksheets+vowel+sounds PDF link annotation
    • http://tlw.ro/UserFiles/file/vifoxudabuketis.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/b9dgkhiq5orsskcj2c58upevt7/26230996301.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/47817732996.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/puvejupolepakus.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/69108614427.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/60859199073.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9b9cae876e46aefcc406264638e758d7/68535404046.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210819021758.pdfIn PDF document text
    • https://fultoys.com/userfiles/56143623100.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/xutuninenunajimezepojif.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/53238486730.pdfIn PDF document text
    • https://cubic.is/userfiles/file/defexugojitesitutafalij.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821b7428b33---sisazelubazimaxev.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/u42kh5mt1torqppi0o4q03kcv2/16627068864.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bguj5lf6grconlrc7qoa3q4u4h/zusisonivumobizi.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/60717678015.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/86451192196.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bafivajiva.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/jurukaxosixiserumibadoxe.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/monibitikun.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36920640772.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/doleradipalijik.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b853e363485---puzawurizuvus.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_off0000c9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C2 10652 bytes
SHA-256: eef90482917685037c7922adb7516e8c71aa0911e620bf02232b0218881723d9
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 17424 bytes
SHA-256: a8d368e3e658980018dadd6fb92dcbbcab6ca5eca487936e9fde462ca5eb4879

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