Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04591777835d8e3…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 07:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 83d75a009594ea1e9b5247b57a454d12 SHA-1: 79b7550d62e4e48e42db5d0132205910dae86dee SHA-256: d04591777835d8e3c916a13cef037463b918fb45c62aa0a14b950a89f34bb46f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised or disposable domains, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=blender+3d+android+apk+download PDF link annotation
    • http://tea-ra.com/user_data/upload/save_image/files/29458176565.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161432e1a5e40a---26505761614.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/50352647620.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/99407822442.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bda56267a8---51539706956.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/rinegawu.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/lowafujijikabogetakikidu.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/49103211255.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/resuwujeki.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/nulozonosomodivaxevirugu.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/61844189904.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/71346268559.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/wutapuwowogumowukigutipaz.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/33dfc41d506e9044b0f741a0f5177be3/xukarikerobisuwibaze.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/voviziputijojotiki.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/29968105114.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/tudix.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/budiwur.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/2723089680.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/dexibudifugajadanik.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/doxomakigemimexewuzuduwog.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_off0000baeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEB 20028 bytes
SHA-256: 649cb5bced98fa7c20c3dca1ac50e712b11394a44a8db33baca61c696a48c0fc
font_01_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 10520 bytes
SHA-256: 543f3def0bdf13b9f72c703843815d8a0c259f96a6c77a73233e0458f1dac496

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