Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7a5b8c80e5043a…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 07:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f5117cba391754c82bfb3f4522503738 SHA-1: 30b2b5975cbe255affe5f707217c4c8ff2cf7f81 SHA-256: ed7a5b8c80e5043adb6a108a0b8239427801184733478da86fde52f532717118
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 websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://ketchas.ru/uplcv?utm_term=non+visible+light+spectrum PDF link annotation
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/44206376747.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/resimob.pdfIn PDF document text
    • http://expresskaliski.info/file/tenate.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/36719150832.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10f00c785---sekewurit.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/josunaketavifuxo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395fafe0ab9---30444202665.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61351966416.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/nosigokinilizagibuto.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/lexenososugozawiwa.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/15150520544.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/sunububujitofas.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfm9tg5mh4gun0ps8dr0dlr4k0/buwotur.pdfIn PDF document text
    • http://tabletopad.com/images/file/jorukidiguwuwegug.pdfIn PDF document text
    • https://hkki.org/userfiles/files/54734749548.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9031762086142f27a046ff.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/21370060468.pdfIn PDF document text
    • http://precisao.net/files/files/tevotukuguze.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96c39ff33---rasotin.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/63521988555.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/feburegozo.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/xidaxopamisuwos.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/5687345362.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_off0000b411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB411 10940 bytes
SHA-256: acf09b7fa56781af146e40f906a802bb589683b5e2b9fdf2550fbebdef689411
font_01_sfnt_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16960 bytes
SHA-256: f46377a1db2fc3a03a7ab29498d3e3ecd4b93428a21a62685927ab7584dbf4f9
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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