Malicious PDF — malware analysis report

Static analysis result for SHA-256 9465c3d2966faf6f…

MALICIOUS

PDF

90.3 KB Created: 2021-09-16 14:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 85b1649f94773f1bce6417880d52eb87 SHA-1: 5164d104c8de4f8c4f28b2887a324f4bbd96b2d0 SHA-256: 9465c3d2966faf6f467e3c9bf9658fa13612bcdb36e8f01aeafb442af37af4ef
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are hosted on compromised websites, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.oneworldkarate.com/fckeditorimages/userfiles/file/vizopunikapul.pdf In PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/525479150.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/bowujig.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/73954403776.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e405f8639c---15052299811.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090115185273499.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/rolekebumotekufate.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/90069886223.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613336a82e74a---68280143385.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/55330498837.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/3022988183.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/27668621931.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/kusuvamotejivipekifabiro.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/80045904521.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/64033a55d1c6fccc54a4ead3b41bdc92/26993487125.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/64985460977.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/mabamejovudatilab.pdfIn PDF document text
    • https://draw.pt/home/drawpt/images-editor/file/mepejogimudinod.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f02dd2677f251a84967a1001550977a3/gejafiw.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/51599913584.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/51712108771.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wotonataburuganeruxev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=zelda+emulator+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_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 18568 bytes
SHA-256: 1c6addd3db46902fb5bc26b75793b671035cc711772ba2ffe356923b585907fe
font_02_sfnt_off00014409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14409 10408 bytes
SHA-256: ea5ffb87fa61bfae8ed04c8a6a5a547e903ed2d3e9789c6d95e5767f38da0d15

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