Malicious PDF — malware analysis report

Static analysis result for SHA-256 60716b945371a31c…

MALICIOUS

PDF

97.0 KB Created: 2021-09-19 10:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef7d34d50530c522cf5b655e590082a9 SHA-1: 66e740af9399754a3363f8700b9da11fdd945ed2 SHA-256: 60716b945371a31c97a3be98fc5f6fecd4a9c79c52cc8c38f30eef38da0d8bdd
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads and link farms, indicating a malicious workflow. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a payload via a deceptive button. The embedded JavaScript is likely used to facilitate the download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • 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.
  • 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=this+is+me+letting+you+go+ebook+download PDF link annotation
    • http://yung-shun.com/userfiles/file/34711835481.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/dimogobot.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/43488533074.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/fajixam.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937ded0d29---97766026478.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/77853666154.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/76995084744.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8fe0ec06dace55cdc3cf24dddfd02d8e/83649528495.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/zoxuwevim.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/12633c0ca22ce7fe4faa3cd96f6bf871/supefapa.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/58309666827.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/66295831071.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/nosep.pdfIn PDF document text
    • https://faceless.me/userfiles/files/semipadijezomubezuzaw.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/moxinitaxikizawiw.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/32830458502.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/41938734212.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/komijofixirasarizipiko.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/faxetimakara.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/39858068421.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/rasaxefelugirefox.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/tuzalu.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/26329121344.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_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 11092 bytes
SHA-256: 1cec2cb31b26d33e1f0030ff47bcd05565e9539c488e5c97c67d1050d4bedae7
font_01_sfnt_off00012c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1C 18904 bytes
SHA-256: fe4df87686e3d049fd84cf9e5394bceee8884bba1c9fab778ebe0bf730c34ee4
font_02_sfnt_off00015db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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