Malicious PDF — malware analysis report

Static analysis result for SHA-256 26562026c99b706b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-05 14:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51792b349807dbe6ebef41b46ff2243b SHA-1: 91591c121b18d46c160d3efa170ebd8478d6b5f0 SHA-256: 26562026c99b706b383efabfb081186abcff91f0a04bac621c09b72a1b2ab77a
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages. The presence of numerous links to potentially compromised or disposable domains suggests a broad-reaching campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1610b38537473d---revovamofozawonaz.pdf In PDF document text
    • http://erimti.com/userfiles/file/84668193741.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/diledibotokerubub.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/8234567415.pdfIn PDF document text
    • https://pmms-online.com/assets/file/rajarowewegu.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/94efe546160e1ff83531d453dc919fd6/zoxevazaxinupo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/kagapovek.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fativatevesakididerije.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1453741452610b17fb6a917.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/wofedatorunojugudone.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/vawavew.pdfIn PDF document text
    • http://snsi.jp/image/news_file/robogivoxitowe.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8fe12af0a5caac2fa52e6c1163948d4e/sobekatalamovux.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/8b5d99b3d80ae510ad8f94273712a5b2/64560740037.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/91352852147.pdfIn PDF document text
    • http://darec.sk/files/files/6362609619.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cea0b9d826212b035c6bd0536dc0bf5e/sajilitogafi.pdfIn PDF document text
    • http://hydrem.ru/images/file/wukuvokemube.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/futobotow.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/329c1bf8f3ddef24f1fff41bb5fe99fb/kuvadalidomifegifo.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09fd2bd516---93699460024.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/83026684441.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/jolugofubez.pdfIn PDF document text
    • http://www.polni.si/Images/files/29547795210.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/61300707270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=argumentative+thesis+statement+worksheetPDF 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_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001140f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140F 10836 bytes
SHA-256: 57c98e75a1ae3c1478e5302017f807c44cce49b66a473f8277221e6b94ec83cc
font_02_sfnt_off00012cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF9 17972 bytes
SHA-256: ed5c1f93a16cd6b297e879b777d64e8e03061281154218af04bd234115cc0e3b

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