Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb76285fcc721f42…

MALICIOUS

PDF

90.3 KB Created: 2021-09-23 01:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cca21a1d3be291acc3aeca2130d813c SHA-1: 8143c02082b13fda980c144ae74f201d2c58cddc SHA-256: cb76285fcc721f42d73627186e3556e04437962f010928bb330f1a578030023a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and a JavaScript stream, indicating malicious intent. The links point to various domains, many of which appear to be disposable or compromised hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate this is a malicious PDF, likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=funny+things+that+start+with+m PDF link annotation
    • http://csc-020.com/userfiles/file/20210903235029_jo2rnx.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/17244823806.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/gavibazunifijipazugulu.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/38700844155.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cf6aade1ecab72695ec7740eb650c0de/91004172371.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jawopedoluxexa.pdfIn PDF document text
    • http://standardamulet.com/files/files/625592569.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/momagowenekufus.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/29459211033.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/26135484479.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/kopumategimububudaza.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/jilovakapemedelet.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16145bfe533f3e---fedisitujesuxilavumore.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/fobixidajomepiditik.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/7162215856.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/pidoruzidelize.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381858f4e6---14637985091.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/58950324705.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/81097793420.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/zagobutapesu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vemovisunubujalot.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/49514081494.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rarasosozore.pdfIn PDF document text
    • 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_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 10532 bytes
SHA-256: 3804b46ef56305676e2c95aecba257effedbc0375610fb41b4a12bd1a583b976
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 18580 bytes
SHA-256: 7bb3c7930780d41ac5a787d814db82b93695b96b9e1bba2d7bff3b3c5831ec27
font_02_sfnt_off000143d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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