Malicious PDF — malware analysis report

Static analysis result for SHA-256 610d10f3fa99deb2…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 18:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e764bbe7d6532899316f27462b8ef6b SHA-1: eed9fba1f1ac3e5134a3ede62a4a5aa6fbd15b33 SHA-256: 610d10f3fa99deb279d718fc1188849c9286a32fe6daa9a101b06ec888cb78e5
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=robinson+crusoe+book+pdf+free+download PDF link annotation
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/bomodumi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/91645656517.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/79450079244.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/aed0bb5f17aa664d6c501ce2d5055e9c/besubupoduz.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/zukilezux.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/rasegefawa.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/fatibi.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/55675943494.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2214f2fe7---kezanomotibigipu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf153d444f5---20507346202.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/tazopubunekujugegot.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3842069ab6---44521567754.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/giwokidakozeravexu.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/ketodoxulodemelebobi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b8881f26a6d665e95bfcedd369d023a5/64680533713.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae444db3f---63876274053.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02456792e---nererolileberuxalifumun.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/fafogi.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/25150083409.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/kejasevoxunu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac325d991a---70354760887.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d194b885---mugirik.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_off0000b8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BF 10976 bytes
SHA-256: d3ccdb412aed41fb539627e95d06a93cba5da2ef774f82dbf57f666677076da7
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 17004 bytes
SHA-256: 045106d25eb673468b8b1b00c8a8627fd035d5bbce3d8b3af0d250e2e1ad7eee
font_02_sfnt_off0000fdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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