Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadc7760b67d95f9…

MALICIOUS

PDF

75.3 KB Created: 2021-09-21 01:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e6c54c8169f7afceeb95a4d8f0919978 SHA-1: f378cca27b4f463ea24ee57014760dbe718be927 SHA-256: cadc7760b67d95f9b542d992a0de0c75f1bcea6969a67ff8d5e5ef15a3b0ad38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to appear legitimate but hosted on disposable infrastructure. The embedded JavaScript likely facilitates the redirection or further malicious activity initiated by visiting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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.
  • 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://tselectromechanical.com/uploads/CKfiles/files/31923111962.pdf In PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631103646_75392f79d9.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/83290087324.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/23224178922.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/15699427310.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/tajumasedemex.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/60811353805.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/nejagunetatu.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/ropararejulipakaselade.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3833c4e36---65091963032.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kfln6eb32evk09v5fpu332h8vb/luzeg.pdfIn PDF document text
    • https://www.parcdelorval.com/ckfinder/userfiles/files/gugikonapobidokotupe.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/fukadi.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/36182402884.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/wawujirudulodumululeli.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/19415165052.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zemirasovaledekorajetaw.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135545ccec10---ligalezujozerugusivinip.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/92317202321.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/tilegefilewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=francesco+tonucci+pdfPDF link annotation
    • 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_off0000c3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEB 17440 bytes
SHA-256: ac1df31e1a83f8aa2b09e88498bcb3e26c085ab5297e28251b254869e4de0743
font_02_sfnt_off000107c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 10644 bytes
SHA-256: 5eedbfa41e93b1c6b0683c8cc36e25269756df4306203fcd94f4751ad95d5c99