Malicious PDF — malware analysis report

Static analysis result for SHA-256 711059b82ef15fb8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 21:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc2f79cea39d00c6409a5846304884f1 SHA-1: 2dbcff93a5f4b732818765289e1626db1475f6f5 SHA-256: 711059b82ef15fb8da1e3085fa2e8353a5afa21bd1898491eaa62f32870fa4a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://globalmediaminds.com/uploads/files/xixuwerulipaze.pdf In PDF document text
    • https://salondumariagededijon.com/userfiles/file/86827028886.pdfIn PDF document text
    • http://mestan.by/images/file/vajozu.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/gabizomulovigavoxol.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/sepowuj.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/tedizowixorawegodokoxak.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0tnan02lf7d11gg07tago2fef3/rukolimenaku.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/80459155798.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/ponuziwimef.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/juxejoriwesevidawate.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161394d395939a---wevare.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tosanojurekibivus.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelukowigalukeja.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/keselefagos.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161401ac6a0a01---83642012257.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/vuzamesilusudizejovo.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/bizupuwugaxujixawis.pdfIn PDF document text
    • https://rintrans.com/files/pigitewowuk.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/16317552738cf430867408678d1a5a.pdfIn PDF document text
    • https://scalper.ir/data/files/file/65502266178.pdfIn PDF document text
    • http://superbarter.sk/media/file/75203029862.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3fd1a818---80634154542.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/12872205255.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/76311764657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=clean+master+app+for+androidPDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10692 bytes
SHA-256: 4ddec0fd3d5d4baa9d0b8eec50f4e392d2cfd0d6a9194d4bd11c877da4031cc0
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 18264 bytes
SHA-256: 02530f2d45d95ad4ef8ebf9de0b381e347f9bbd9fa3e81174818266678dde997
font_02_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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