Malicious PDF — malware analysis report

Static analysis result for SHA-256 120ca7f8fc929f00…

MALICIOUS

PDF

91.8 KB Created: 2021-07-27 15:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 275b6a03fdb293302430b7b9911b32ed SHA-1: fb86258935dff50a746df6b25ed47ecce4ad6a7b SHA-256: 120ca7f8fc929f00dc6b393c4f4573dac28319a5c9ac812498a32513f063b696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be SEO manipulation or hosting phishing content, leveraging the 'utm_term' parameter for tracking. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cortopolis.ar/userfiles/file/49909267957.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00111b262---44475452048.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/nadaxitinozas.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c721f0fdf---23071723151.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/67243074282.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0252e65e82---mezojebolonada.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607deef2448b3---12604840249.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a7d0505d---limezulasage.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/84960358893.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe02ee43d4---35674465918.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/jafififurapuzafinebeb.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/16477248892.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xolosibefibanegurerobada.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a905f919ade---zumazuvebonupawozenif.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/manezosozedirebuk.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/70367710228.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/nhhb3tf1aokuu5lpt7d61l6lvb/35552832972.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majazapowifuri.pdfIn PDF document text
    • http://cga82.com/admin/File/givapus.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/gd8o5tfc926hhlbe1ekatcfvgf/83006523470.pdfIn PDF document text
    • http://renovator.cz/files/file/tobepademulivajadexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+printable+horse+race+game+board+templatePDF 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_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 17904 bytes
SHA-256: f01b2f2b7a58cc187f718608c56e5fb0949be09bb4a3f9a2783599e2bec85a0f
font_01_sfnt_off00013091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13091 11076 bytes
SHA-256: c03fb14493d4a06803a2a7a63e6045be9fd3f9b3f992e5a1023a1c1e38f78d7f
font_02_sfnt_off000149b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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