Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b3404c02a0e8e2…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 12:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f514b02fe0488e75b32572c6821009c1 SHA-1: e2e07277c1951135895b6e37977990955c36d08c SHA-256: 06b3404c02a0e8e21f1ed98fcdc685e6f076a0ce80c93f4c26270d8566d3f6e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=games+racing+in+car+2 PDF link annotation
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/pegazemulukazedomuberukin.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/lixijifigafuxoxudexug.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/gajemukaxuvelaxefufevux.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141765ad065b---menowawazazudema.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0613e153da8f1275ff8817a69926b9a6/temapezezugaka.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/37593740659.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/88632873772.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/17932634704.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/fagofud.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/roribeku.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/95239281581.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161330411277be---51747200507.pdfIn PDF document text
    • https://simorgh.it/uploads/file/jexudometejutuputapeg.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdb9b0456a---jaziromenokumosimal.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/piduvogusatibipemeguv.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/62902977975.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/42555391524.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/91330387850.pdfIn PDF document text
    • http://benrassam.com/uploads/files/29047371932.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/toluke.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/43317685720.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b142aeea51b26e35da6e835b0275cea4/23624308722.pdfIn PDF document text
    • https://autoskola-scp.com/files/40749371687.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_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 16716 bytes
SHA-256: 0f782ed5fecdb9ddea10a0dc07ef06969da77c19d80fe9a4bb900e3dfc7fedc1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10468 bytes
SHA-256: 77b90ee4cff91a2f5140ad13f766d9d49cfd2bf4ca49c66b652348b70fc314cf
font_02_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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