Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37fc53429c5a9cd…

MALICIOUS

PDF

91.0 KB Created: 2021-07-30 20:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 768d0f893f9daff6503a773ab4bc4235 SHA-1: b6971206ef7d8e529258682dabb3a057a6b8c5b2 SHA-256: a37fc53429c5a9cda463121e950365797d00412fa1052b6c40b8ea0ddffd5777
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware or lead users to phishing sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b365de8c75---44700144510.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1ab4ee639e5127a3d5da8ec239e210ef/wobirisuvuwotozeme.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2066346d26---20453011611.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/48774930339.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097275c368a8---tenunenorabobiwakavepa.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/83bl7fopud10a6uff7ouubhsln/bitiwogekaguduwubidotulof.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/61811671928.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dedfad62008---dubifubo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e05e53691---modoje.pdfIn PDF document text
    • http://zuche0551.com/upload/file/10609959404.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/af19f77f14aa81f6ba1865f75690d7c3/zitivape.pdfIn PDF document text
    • https://ahha.az/userfiles/file/zuduxevomerit.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/nibezenirujagirimi.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/jiwutovugijazujikisiwi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zofaxewanarafosobikobomu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/967vl4pckfaj1pjista7jer7gr/xetomun.pdfIn PDF document text
    • http://halmar.info/userfiles/file/lugulezir.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56882538774.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085aef72ba63---96852147232.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad61c3a8efe---65055139556.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ovkj3c6661ocvcid8icl0sau9t/62014432482.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zefunopodovamuvixavixoguw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b6d9aefca---62245972502.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16081097cdddf7---2496808217.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/3663270150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jorge+basadre+historia+de+la+rep%C3%BAblica+del+per%C3%BA+tomo+2+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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 11328 bytes
SHA-256: 08cb8cef3d746e2873b3f8fea1c4014d4475e3eb239863aa03baa204c6058191
font_02_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 18208 bytes
SHA-256: 2c5ef8cc4c09a04355d0c2c3928b5098539f89985d71f9bd02de1ca9caf31a1e

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