Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d047606a48f54c9…

MALICIOUS

PDF

77.3 KB Created: 2021-07-09 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 244d6bc1a898e0f09d510584553c5112 SHA-1: edfcc9c9786fda7e4a0e3b6c17cfec78f4d89fdf SHA-256: 6d047606a48f54c93622fb7392a7029f22bb8448ce38c6ecd31721d88fa7bec7
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites. The presence of multiple distinct hosts and the nature of the URLs suggest a link farm designed for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b187c060dd---53882930664.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/61683a4bae67ee58074a295dafe26db8/momanodumazofujidutaf.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9pufirtf6nl83e31of6hlgatus/23466345068.pdf
    • http://tasarimak.net/ckfinder/userfiles/files/wejez.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b260cd0d---dojuxoxokegexeruxigegu.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f3d23dc46e81ebea1dbb98ea6dda9525/telupituxatel.pdf
    • http://bright-mineral.com/uploadfile/file/2021060615032222.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a68390a8c9a---71657193112.pdf
    • http://learningkey.org/userfiles/lokipuni.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba17578a7f---xikarapinebimupiwadosomi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6b8e9b60---xumenimuxilajovuluzo.pdf
    • http://hbleg.com/admin/userfiles/files/68694810226.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/11f739v2bo6e01t4eajb9mhe30/ponudufajilanujogaliwubix.pdf
    • http://www.toptehnik.si/images/41456104732.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/hkuvdcjqljmcto61gqgutoh7r7/83866243301.pdf
    • https://ecole-anglais.com/upload/files/24368014522.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13510e956---ruvabalajeke.pdf
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/90497117856.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/u1r7l9dbqeh8k59nbs6tfad5hc/685664512.pdf
    • http://aarogyamedico.com/userfiles/file/zuxakovu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890a030df1d---31516264786.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cda6139fe---xubitezubatokikinilamaxud.pdf
    • http://altaprecision.com/userfiles/file/20431990872.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2e189501---kirusibadejifogezu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9sp796pq7un5laiuh2vdbj9qai/mogiluvejuvez.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=operations+with+rational+expressions+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 16792 bytes
font_01_sfnt_off0000e151.bin
a6ad3a5c0e136acc034ac3f7c35860916c9e05e84f453eede103ae0b27e7d7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10652 bytes
font_02_sfnt_off0000f9bb.bin
69993928a8805e2e860926c40eb710adc8512aa2a5ff22efbd125e196d814124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 17708 bytes

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