Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4d2ad4fa15034f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 04:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 06ff128ab182056aa9bf719fc09fcb6d SHA-1: 189dc134e5072e297b7602cdfe67e94708bc4aa2 SHA-256: da4d2ad4fa15034ff06461dd87efdaa1744171844d29dac9ad1b71b5c95ec4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/61b26dd2e8a712e0342cc702b2d47b6c/moladorepiviku.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f454b8f9ab6a356e3e16fad1229a9517/pobofivujajimutowejo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ai9hrq86u5v5lqdlfjg7m0ak3076a9oa/33793073098.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883df7e2967---malogukunasopepumo.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/vibowagomaloxuvasesowo.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/028af9f0726d85bfd1cd8651ebde7a7c/napedojikoje.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989818417b6---rewenalubis.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c5aeb714d97add71d39b61fe06975e90/widunutanokewopo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9783e2f111f8af581b5e77604188ee34/31567332377.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/dodimukusu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/76474347555.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/55994058492.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/13004565565.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0bb3847b---4190747447.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e9d8ad143---fulazumexapagivusilasuwiw.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zoguxumejo.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/57295501290.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160870af57496e---84460874822.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/nitixosusab.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lopaxuzaxuvoxe.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/66000872748.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/zowovaxura.pdfIn PDF document text
    • http://samtle.net/ckupload/files/limedoteb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=prosci+change+management+book+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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 18740 bytes
SHA-256: d104cef791a9a80b8cbf7976b1244d30c42ee2b4dd5ddcbaa6d3f57301180a37
font_01_sfnt_off000107fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 11256 bytes
SHA-256: 3330e608b694aed1807705a0fb4ffe0c8f4b0e59960066565d935bd655c126e5