Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f4562c53823361…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 12:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b982a7b31e5632666873edd6aefc2000 SHA-1: fdf0b9934e0c5ea7cb304b35b1ab528fd6031db1 SHA-256: d3f4562c53823361ba2cf4622b5447a339160951ea97a0a7477f7d4963ab6f66
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download or redirection to a second-stage payload, while the link farm serves as a lure for users to click on potentially malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://heninrealty.com/userfiles/files/polefepuviv.pdf In PDF document text
    • https://olamare.com/img/uploaded/file/80045077905.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/53193638453.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/dunaxuwosowugatisujumujo.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/97723713338.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/mikosokanudikaxav.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/53143518684.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/zusanarirebolirapaxo.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/53703359287.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vopijevekiwewa.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/nimiravamiwuvogesami.pdfIn PDF document text
    • https://phunhai.net/upload/files/tejefut.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/guwakidijavuxug.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/tusipub.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/95894377411.pdfIn PDF document text
    • http://dakov.hu/_user/file/tifevudizujiwetinifiropax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d656aed40f---31517674985.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/34260635364.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/54051268224.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca0f3bbe06---10344118588.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210916131301.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7ba2667c24b41ad65565bcb2d222ce16/kupotafufigesesizegidef.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/17274483143.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae0e239a9---xalaxuvonujekonazewugiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cobra+kai+android+gamePDF 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 19836 bytes
SHA-256: 6508d30bc2c90a93311e1059c6e725b0a7819930db3c5012e8b22798a3dbfc78
font_02_sfnt_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 10544 bytes
SHA-256: 31de90f62947c8ebe7bd79f8fc4118d7293ab2a8c8489da727f617430f48f193

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