Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e60c2e37f1db7c…

MALICIOUS

PDF

72.6 KB Created: 2021-09-19 10:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d54052a0aee4aeecb5582be1de1dae54 SHA-1: fcf32a9a3824769242491ad90e6c2e8b351699ea SHA-256: d4e60c2e37f1db7c88a8e6fc027e5a3a5717a68a1161117a5ef66faf308caa7f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall structure align with a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://utpcomp.ru/uploads/files/mutalozenazevuvarakaraj.pdf In PDF document text
    • https://altstudio.be/app/webroot/uploads/file/zulisuv.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/gakinobolebozosilefa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/9m2odbru0umpnnm6c49q0us4l8/53381686772.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wuxorajavakekuwefazebasib.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/liboninodusikudovatomake.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210916_A315317ADC486F01.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/1844490812.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/pideregugodi.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/sijotuze.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/60913439078.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/47587846041.pdfIn PDF document text
    • https://asken.as/bilder/file/bupinaxum.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4005d53a---74273801638.pdfIn PDF document text
    • http://webs123.com/userfiles/file/21581097867.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/jepodikij.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/fizogalaruvigavobawoji.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/mogivedotagilikozo.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/53995466745.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/kafexuzot.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/69429917578.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e76337b3---6761331595.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/bewapajurewosozuzoxiw.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/72224269.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/zunekapivegume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+watch+face+app+wear+osPDF 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_off0000b9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 10476 bytes
SHA-256: 2e42bc69de5fc0be610e063bd0fdea99aee0e8bf9304e4c9d0ff692975a326b9
font_02_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16468 bytes
SHA-256: 42f7505afd6af71ebd679b19f9b50d1fea85faa2cba2e2ac62110e1f18891959

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