Malicious PDF — malware analysis report

Static analysis result for SHA-256 808a3e507795eea0…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 14:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e39a8d24842055c9d0e20f9cc69c908a SHA-1: 2735b3775d704a45e4542dce9b78bea39c5354bf SHA-256: 808a3e507795eea091a960602811b632657adb14d6bdf534a6f7e0b3e6c084f4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure by multiple heuristics, including an image-only document with an action trigger. It presents a link farm to numerous PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The embedded JavaScript likely facilitates malicious actions, such as redirecting the user to further malicious content or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://motodubai.com/uploaded_images/files/bimavuwusujetip.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/cdfe3a36639c5c1217799b06c860c0cd/momugamoxopisawinigumu.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/47192701078.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/68339202299.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/fedevizo.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/gazozoxivude.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/49209413209.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/muxaribabuji.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16146b4f349fc0---tumajivoneke.pdfIn PDF document text
    • http://w-mill.jp/images/file/kexapovisuk.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/424b785f3f8361888f36bc8814cd2853/zefeneko.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/linajudesarisidesuranowut.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/26436933362.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/kulivutovafujipi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef89e51537---18781474898.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130904eed281---22401925243.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/palok.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/97243787542.pdfIn PDF document text
    • https://pellevah.com/upload/files/mejafumomonote.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/295592639.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/diwigi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/94693105390.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/kobolowa.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/26003107278.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/vejenetigi.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/57372940205.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b269d41219---53864297086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fzmovies+download+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_off0000b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE57 14400 bytes
SHA-256: 7f259c4dbb3c6fbe7de05965e969978e2d2e0868ebd9be04f60bbcb1d4403393
font_02_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 10604 bytes
SHA-256: c738ded1fa37ab5fb4d1c66aaf0fb12dd6e96fde940827b5b5b0d29c4c009e1f

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