Malicious PDF — malware analysis report

Static analysis result for SHA-256 4209ef07313917da…

MALICIOUS

PDF

81.4 KB Created: 2021-06-27 23:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce4db5d2fa25fb1396eac2b23ccf80ad SHA-1: b7fc556f2232fd5c76f5ec689205503899957873 SHA-256: 4209ef07313917dabcea23d55035c0d4b5b485418d5b5252a7e86805480151d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits a PDF vulnerability for client execution. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://kondicionery-ivanteevka.ru/upload_picture/file/sudej.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/2034105302.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5r7sd82f5cpioi071tlehve55h/rinam.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/1sjgs4ij603svqlljiokv8e8ct/79255741978.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/afc418aa0da1ecf6210830d6f7a1ba2d/dadegubisafibamudir.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/96373392054.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802006cd02e---33963467890.pdf
    • http://beerskiboot.com/img/upload/file/xivagefi.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608275dde76ee---genupomeveta.pdf
    • http://zjqzzx.com/uploadfile/file/2021052503465873499.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/vogoxunogobux.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e483ad7bbb---78662674265.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1683ca309---wosimofax.pdf
    • http://hilimall.ae/uploads/files/gizutetegejetagejum.pdf
    • http://x-site.by/upload/editor/files/xexaxojuzejowodazuw.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed8fcb90a8---gelilojavowuvof.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/98862585519.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072025eed476---wawowo.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2651ecf2a5---zimuxubimimowojuxup.pdf
    • http://nadiadsa.org/userfiles/file/tuxokirev.pdf
    • https://bedandbreakfastchia.it/userfiles/file/zarukolebof.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b049eb7a662a02a8944c9bb1310ab1a7/gifimoridagaxovugub.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83835040445.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e31d84c1---63162143593.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=create+displacement+map+photoshop
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db78.bin
fd292ef9615c430ccae28d224ebbf35bb1b3297fa69916c662a48b28975ef9a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 17064 bytes
font_01_sfnt_off00010813.bin
3ce8c04479497ee5ecba56f2ec670fe111d0054d7485e18d243f4e12badb2931
pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10808 bytes
font_02_sfnt_off000120c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes