Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b8fa6e14527f5d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 20:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecc2aa0267288ee931b73f1663a57147 SHA-1: 5b61a72224773b81a5d00b52c8be06bf86a7b167 SHA-256: 54b8fa6e14527f5db020513cd73d8608ccd552fce2a7c5a52a9c7b8b616aaa8e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary function appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ujepites.hu/userfiles/files/9904568526.pdf In PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752824643bf---91295756466.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/73258826795.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7624172c3---21868765386.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e259af0c4---96720247096.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/98922454326.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/52179220984.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/98982075183.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/329add7fe2f945d2cafcb8874c19f93c/zesofebodasimim.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/24300405044.pdfIn PDF document text
    • https://olterus.info/contents//files/nigokexowulipukut.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5d153a87---65264887201.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/12475843749.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/bekezilisobu.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/44034912784.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e5566be2b---timidim.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/zoburimoguw.pdfIn PDF document text
    • https://nomortiga.com/contents//files/zaladewe.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/13655679903.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/p8ft1vfjbigsim3dbmui6b09b1/lexelu.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/41965285749.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/68845400992.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/78565122263.pdfIn PDF document text
    • http://ahchala.com/img/file/69823744589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=holding+up+the+universe+jennifer+niven+pdfPDF 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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 10900 bytes
SHA-256: e07e445761960192c869b7b7e86cad394965ca2701f9fede2584c744fcb20f36
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 17848 bytes
SHA-256: b1fa87fd1cd00e4fb3c52fc210d3913abc46f05f6a2961eca5cd10be9a8cfb6d
font_02_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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