Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00e5b1225968fb6…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 01:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38b627cc82394aeef0ba9d29b9829d28 SHA-1: f964e621bf20e2c2c2d52f1e4c7dade706607410 SHA-256: f00e5b1225968fb61dc61770c089b70b2825f70a34bf322f77e6d1692b316f1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, identified by heuristics as a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://huntic.ru/uplcv?utm_term=mx+music+player+pro+apk
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161310130af108---mupufifunabidofeguwedo.pdf
    • http://wohntraumgmbh.at/julolub.pdf
    • http://administratieindex.nl/images/uploads/pasizajurividulejaxi.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210911200442.pdf
    • http://mrybalko.ru/files/tamawuzegenokuwawez.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613882d3ed0cb---32518770326.pdf
    • http://hyundaidongdo3s.com/images/files/xubadasutezuwot.pdf
    • https://strongpointmarketing.net/userfiles/file/75443375422.pdf
    • http://sangjeom.com/userfiles/file///61816880745.pdf
    • https://mmrh.myagenda.cz/pictures/editor/files/80995643827.pdf
    • https://grnca.org/img/files/files/nizan.pdf
    • http://ganteltechnology.com/system/userfiles/file/xipisipuxirukem.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/38256741007.pdf
    • http://3sdent.com/upload/files/7471939333.pdf
    • http://panova-art.com/files/file/bofodutadutujutokoget.pdf
    • http://studiolegalebisantis.it/userfiles/files/jarojepufinipelezabek.pdf
    • http://ipayon.com/root/FCKeditor/file/ridubesamidugusojapigixen.pdf
    • https://fobh.net/userfiles/files/potikide.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/goguziwivore.pdf
    • http://tjjjsh.com/uploads/files/gadojipavebe.pdf
    • http://hzdsbg.cn/uploadfile/1630518472.pdf
    • http://sethhukumchandschool.com/userfiles/file/sobifekexejetawililug.pdf
    • http://csim.jp/ckeditor/uploads/files/85316230845.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614451f55d1c6---54819851909.pdf
    • https://mediaget.ru/userfiles/files/josajafoxedalofamijido.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_off0000aef1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 16792 bytes
font_01_sfnt_off0000c708.bin
a44c7ad06ac3e9628e40699195260c6fbf6df2967346c16b46153bad07256a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC708 10732 bytes
font_02_sfnt_off0000dfbb.bin
4adeff19e28a9bcf97a710d964edcc49f55916597dcf8d216192fcb8ab706e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 15148 bytes

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