Malicious PDF — malware analysis report

Static analysis result for SHA-256 86203f538e9e97c1…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 20:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3798d7415bafea22717fcc28a6ac1c13 SHA-1: e4683cd9640ad3ff4e79876b2fbdbca96f4e90e4 SHA-256: 86203f538e9e97c11e7df65ae3d77d87fbb548aba4c4f7245918f1dc8cde589a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=cyclotron+and+betatron+pdf PDF link annotation
    • https://99shayari.in/userfiles/files/81937556349.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ab94a5261f0fa4b1cd770de0fb7acdd8/87232836294.pdfIn PDF document text
    • http://grimastone.ru/files/10665254985.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/50986009442.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/40b442459c01fdc72d7309151ea39642/77397361184.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/8255281661.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/85398752816.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/zulunabase.pdfIn PDF document text
    • http://bdaudit.ro/userfiles/file/24877950069.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da46935a330---39204878334.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/kurekilazure.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/mukamojowiropowikol.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/nedeluvedarirenezotu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/bojav.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e99bef79b1c8d5cfc1e6e7e60c6eabdf/13595151172.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/54367339465.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/t1936q6abovllqqf7k9p1crud9/rowesuluvezonokoju.pdfIn PDF document text
    • http://elma1.ru/!upload/files/51280890172.pdfIn PDF document text
    • http://veitali.com/upload/files/ziwufu.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/kefora.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/65546876465.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/jjjed4nm66ogl4qtkg26gj5ass/mapeneriwutizakonofixazol.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pghmdjd41ie2ltroutpc50f496/94442417629.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_off0000c443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 10640 bytes
SHA-256: a75cc7d1c3a24e8f14c50199f20104c4f6cb9f0757437a7a9e2f48d1bdd3ef7a
font_02_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 17472 bytes
SHA-256: 0e3305e3f58a58b4cef2dfb925681fcbbefca7062290943b05bc4eed781a8958

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