Malicious PDF — malware analysis report

Static analysis result for SHA-256 f596fb4c09c1d51d…

MALICIOUS

PDF

71.5 KB Created: 2021-10-01 15:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: de205c9d6dc46d12a5eb7ac6a3e60fbc SHA-1: 74de5991110ead0da5cb8ba6b1858dec7d3fb872 SHA-256: f596fb4c09c1d51d1ba7ccbbd406da59c2b63624a6d60f7504ecdd769404d654
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 disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://srmtteaparty.com/uploads/files/202109190633545744.pdf In PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/mopabadugelulutimexador.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/30648605505.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/jedasatewigejakuruvulufe.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/55581449510.pdfIn PDF document text
    • http://linker-apps.com/files/xupetuke.pdfIn PDF document text
    • https://insp.biz/img/file/tivefakilib.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/17586190996.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/90381163607.pdfIn PDF document text
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/toman.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/92538873374.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/72872659416.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3ca26c5695e5fdaf51e10e98dfc7ab01/79681284119.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97242852934.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/livinuvipunawijerujim.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/12795363578.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/jomadoxebumavek.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/daxepijanimaregorexag.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/todeta.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/10590406714.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613345ae1fada---97896144876.pdfIn PDF document text
    • https://guijek.com/userfiles/file/46332149727.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3360875a42abf4243a693c0fa078fbd2/nasirive.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613710225e7cf---begotubaruzuloban.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/98438640965.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/61540016432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=words+with+friends+on+computer+onlinePDF 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_off0000b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FA 16796 bytes
SHA-256: 038ca77bb7ee287f20e83d25f7ec918b78bcd4593d700b47c5a3e44d69116725
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10900 bytes
SHA-256: 4d3fd73e801ca91f6574f75d5e2dfcc7411909adb1162a023426d71923957b91