Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a08227d0ab7996c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 13:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4ea44693bd7ab3d7b1d644f2259ae61 SHA-1: 985dbf5a8fbcfd656306d024d2fd4d7fb52e5894 SHA-256: 4a08227d0ab7996c98e788872cb5c62d6ee510c2029a0113a98724c8ed0e75fc
156 Risk Score

Malware Insights

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

This PDF document contains numerous external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document's structure suggests it's designed as a link farm to distribute traffic across various compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=1+to+100+roman+numerals+list+pdf PDF link annotation
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dcd6b265---lukusadisamib.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ac76259b0ca647173e927a737c65c7e0/16097320043.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160811d01b2ea5---80491927115.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/lefijolot.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/wufetojuw.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/pidofagurukakav.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ecf007a1---dasixisatudiwofimidugej.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/472d2a18382c23691ee08415bb29b33d/fopuv.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/49384464895.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613426fe04ed0---76817891758.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/30105561549.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/ketamume.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/90339240852.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/bufuxedetiwo.pdfIn PDF document text
    • http://scro.ru/pic/file/57730334544.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/70122625468.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f08d9759217---25116717633.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a73966194---sidutaraxowunik.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/jagiwajonalitoxanokanuk.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/munizanuzonikefaw.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/xabemunidupabejugaloni.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74052156225.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/navujoworobesawi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071596d09118---8506122275.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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10836 bytes
SHA-256: 4335bd28a3271c60d564720a58887ec0ff80cf919e60963a7ecc7a9dae6c11db
font_01_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 17012 bytes
SHA-256: 737f3e485af2b1f60f0656dae93d7ac9c2fcb6a8b22f8e0a00b48c01629636b5
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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