Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d853247a207736b…

MALICIOUS

PDF

84.7 KB Created: 2021-08-26 04:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d901b82cde6e52b9e7aaf45faef66a3 SHA-1: b72dbceab8037ac7768befc91f956ea20ab9f433 SHA-256: 8d853247a207736bbcce1e95c72a658442c6b7cf176eebf5673e597d529e43bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning model as malicious. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=properties+of+metals+and+nonmetals+pdf PDF link annotation
    • https://alarouba.com/ckfinder/userfiles/files/84585488224.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/2364900855.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9fa02e370---sejavipubafojijenunaxexox.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0e0314d6---64694192315.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/nakabenixidizoluzudinij.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607025adc0602---88635668564.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/kemobudagezusubapifun.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/i59ifppq9cm3te1eeujaanugr7/turiwimok.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/96442145905.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/22743554436.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/fubupu.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/56429149556.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611968bb1ab4e---sixixu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161176bf11917d---16570873849.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ed036fdb---wegevamigidarerebumugi.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/783578385.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/4c424bceb969a4076d9004e47bb52f23/47574361467.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/28941622618.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/98b086f4eacacbe98e6845c99b6f4954/28701109053.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/29960214815.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/nidodafebe.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb641b9de2---tokoxeja.pdfIn PDF document text
    • http://cissi.it/userfiles/files/semulipebeletepejuved.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa70f657eae---jemusowoforemenizovokalut.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/76884404463.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/mimejigemebedug.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/gexenanizatizatokofazof.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_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 16880 bytes
SHA-256: 9d2470f9331dbe550d01f008af973b891cec7d88c1806e3fe6050282987b88cd
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 10660 bytes
SHA-256: 7bf2986b598fe906c47d6bbc3d645d4cc58d2a8bb9c2e12f7afb3ed6191f63d7

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