Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb37f96ea4818e4…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 18:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3302e0997e0faaf7af5df38bea5ea4ad SHA-1: 324cf21a77f7df88d1e931eb0f2f92c339740af3 SHA-256: cfb37f96ea4818e4112683e2e73360dbbc12cf39e234d6ed54acfbffaa781220
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which are associated with link farms and compromised content management systems. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://huntic.ru/uplcv?utm_term=download+chrome+in+windows+10
    • https://sapsda.org/SapmaUserfiles/file/mafikenusivugulividazavix.pdf
    • http://baheth24cars.com/ckfinder/userfiles/files/napudi.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161479e8388554---kabuvit.pdf
    • http://195exim.com/datas/files/8593809972.pdf
    • http://wmsone.com/eimages/file/zebadavozu.pdf
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/33487397641.pdf
    • https://organicfertilizerproduction.com/d/files/1149028623.pdf
    • https://kawanmto.com/contents/files/bedaf.pdf
    • http://elitacasa.it/images/file/dazivozegugenixuxe.pdf
    • https://gotoko.com/cmsv2/upload/files/63313398898.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/lojiruzumazoxokel.pdf
    • http://gcsiva.com/files/userfiles/file/sobidififepufupupasi.pdf
    • http://files.ibiza-ferien.de/file/38793104394.pdf
    • https://rhodium.vn/uploads/news_file/38895279015.pdf
    • http://botosani.ro/img/uploads/file/vajuzitimuvifigofexal.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f221701ab6---finumozino.pdf
    • http://blackhorsesc.pl/userfiles/file/61253583558.pdf
    • http://dreamsurgerycn.com/ckupload/files/33395688442.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/92fa54cf66120cd5383ff4a18ac3b6d6/84228095441.pdf
    • https://almavilag.hu/files/files/68584483491.pdf
    • http://travelbilet.ru/sites/default/files/file/sizenusekukuma.pdf
    • https://moveo-sport.pl/userfiles/file/59211881903.pdf
    • https://dottoridegregorio.it/public/file/16764186789.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/deda0cedb56c8cdfc7317bb2ce73a8fe/18839467313.pdf
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63676126019.pdf
    • 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_off0000b44c.bin
3b04c5d7e77a2a9530d049fa1b3ba639487a87da06f9d3f8ee0b3e52078b3145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 15568 bytes
font_01_sfnt_off0000db83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 16792 bytes
font_02_sfnt_off0000f39a.bin
a0099345d9e0ebfd1a7b1ce9ccf14fb3a3f59918890cd194be08a5b85bffd265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 10800 bytes

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