Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db350e60da30f9b…

MALICIOUS

PDF

93.4 KB Created: 2021-09-04 10:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ebcfa0e1cbd1336d4caa142618fdba3 SHA-1: aea5635fd0814df31860e8a8e7961d9d56f48aaa SHA-256: 6db350e60da30f9b05127f8ef9285906f563e9b39f8f3713f31b5946034ece1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/2612987bae7b862bc8899217ae9056c2/7305697854.pdf In PDF document text
    • https://chrmglobal.com/userfiles/file/36186946550.pdfIn PDF document text
    • http://gptools.net/userfiles/file/rezasoj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5b8e9827b---gurevubereforexigedib.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f131c502ca7---tavipemoz.pdfIn PDF document text
    • http://naucseto.cz/storage/50063655196.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tenefuzabavopopedijo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/44887761719.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1b1736fac37f6d7b28d97dba2bf7c27e/goturejisa.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/g7oqp1v9qir598dqpncq2lms5e/safezodudakomaxidedixi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e182c59225a---24081563222.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e482c81f2c---getamisevenosupij.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/21770608093.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nahi3e9qfh5ajngtjp9udemd71/guvuvulalupevido.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84fbdc3f2a---gebudisugusidudimelezepog.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vepifimodaxelevudogopif.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/83863283245.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/79514300469.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b35ed6365e1---53643154180.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/tasuguzanijon.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/vebewezasebigoman.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fn4r4ba7pp6facuh712b2rcmjk/17988695521.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85de10bc9---gemalizefegola.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/99671294132.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/8252410317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+khutbah+idul+fitri+terbaruPDF 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_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10392 bytes
SHA-256: ef48d9f21311473fd76851ad8c1245a60de31c48695ff4142538b30aa9272d1b
font_01_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 22596 bytes
SHA-256: 68295fe6f84e6659bc09457e324ca37b1a5e4db76e6b97c0d4eb5433405bd3d0
font_02_sfnt_off00014ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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