Malicious PDF — malware analysis report

Static analysis result for SHA-256 559a103ec75302a3…

MALICIOUS

PDF

195.8 KB Created: 2021-08-24 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fffb1b26d7df3b3779a0424fe621df5 SHA-1: e8eda1cc5af92b5da7cbf2e4945497abe6141dc0 SHA-256: 559a103ec75302a3694c2bb8b30e48149f512b6fb76010e2d237589ef1e4d1cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates that the sample leverages compromised WordPress sites for hosting malicious files, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/ab1f2345215c28222954bf2d6d636479/gaxufadamepot.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160858b1e2ce2d---47109133167.pdf
    • http://boeschfamilytravels.com/clients/43210/File/gemogobekolix.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/531c48ed013eeafec6dc5adc3ef009cb/98027517071.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9991117f---77744422898.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609499a3ba3fd---solulufulanarojif.pdf
    • http://wanyuantemple.tw/userfiles/file/lesepawepo.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1643e5aaf2---xulitokezogeviwesopep.pdf
    • http://aftckwt.com/uploads/file/15242952865.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lavixofajozepofojekajet.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/52246246879.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/15204519515.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/62fbb85e69288d9d3d7665d3ffd4118f/gasafuvuwoviz.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p6qojp7hptqsf8pfir1iti8oo2/37148830498.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2q5nhjfias4l4m7fi828l91ni0/85883673041.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e7947827---dijuru.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c846309f3---5698442358.pdf
    • http://alnadaoil.com/userfiles/file/11347290015.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06f5c9dab---nosepugopapeno.pdf
    • http://pileshoppen.dk/userfiles/file/rajuramuwudixumujuzeruk.pdf
    • http://tpdw.pl/userfiles/file/51812175824.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/rofakafafesonasiti.pdf
    • https://medsplus.us/admin/images/file/rumobepigatudowefapoji.pdf
    • http://sklepjola.pl/userfiles/file/xebozidejesoje.pdf
    • https://togeltop.net/contents/files/pamadobunatuwavarulukuji.pdf
    • http://soflocops.com/clients/67403/File/turoturifajuk.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/19473851568.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868f91e6d30---jasekixejo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=characters+of+mind+your+language
    • 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_off00029ed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x29ED4 16792 bytes
font_01_sfnt_off0002b6eb.bin
5ce3762156a99f85632488755417ef89a44fb7c611c56fccdde8d1243ffcc80e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B6EB 11168 bytes
font_02_sfnt_off0002d0af.bin
470e27aaf95e2df6d71a1f2a1f3d2c654d5dbb7b9188d5a46d5aa90a93723707
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D0AF 17896 bytes