Malicious PDF — malware analysis report

Static analysis result for SHA-256 036d3dedbd593870…

MALICIOUS

PDF

91.2 KB Created: 2021-07-02 21:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d705aa59041c37ce363c9c69671d56cc SHA-1: f8ce1981a8427c2f952d0d221b0ce2def202a275 SHA-256: 036d3dedbd5938700fdfd4551e9f3fc850b4a1ebb0410c1f4e3890516f491e2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://cructi.ru/uplcv?utm_term=answers+to+what+are+your+strengths PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a644416352---79299738178.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/notiwesododojekoj.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/pafamaxolevu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a01fe45d0---60478111518.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/35084834297.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4316fd2982---57016897703.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/67239818060.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cccb737d3c1966ed300a7498959fae67/roripitaludibekapineziv.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/gabete.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b908f425d12---91185475905.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5ea35b25---4580221069.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a6f401e93ac26940ec57e82cfc9e9a64/noxobaxibiwomoxedul.pdfIn PDF document text
    • https://ka-base.no/images_content/file/73848175591.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c33e5ebf5773d6ef492674ce8bbe2ebe/parudosaraxotabuzejomodu.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/livenagufawimogavapone.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160991d29c7f13---gajomatuwuxufunokelo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/65e5ikkjjaol8hd0krr6c3jvgp/63351122987.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2584cad99db677b7e20edb63d668a3ef/zirobinuruganetosokir.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93dbb76be---roribaritasosuxuzasubet.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbe902334---63322296375.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbebc73a84---pukeforarelimitizuregeme.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/18285875590.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/glsom8oer4ui61tgr39kasi8lk/zadav.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/41397510393.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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 16940 bytes
SHA-256: 4bad19ef59ec60f93e5b9248adac4450211efd15a8bffd5b140f5c9b5e873722
font_01_sfnt_off00012dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 10528 bytes
SHA-256: 2e56a2797ee4af174f8f03813c1244582739ed59232103bdd4f83a2069a29211
font_02_sfnt_off000145dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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