Malicious PDF — malware analysis report

Static analysis result for SHA-256 297d13d928c17901…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 18:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3988af4336e6fd26846566519e841562 SHA-1: 18a87f1ece690cc3d4bc375ce0a2f1e4aa6d2e58 SHA-256: 297d13d928c179011787b9d41cf9389ecce30f987c37d86622ec263705f6fcfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://nuttydog.hu/ckfinder/userfiles/files/33566867259.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/livelejadiviribuk.pdf
    • http://autosoftware.company/autoresponders_images/files/58948438638.pdf
    • http://tko.wavedev.net/img/files/files/16086429335.pdf
    • http://ajitcoatings.com/uploads/wudulajojorujubidofana.pdf
    • http://beiwendq.com/userfiles/file/87437404274.pdf
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/63999361577.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376b566cc05---49541108074.pdf
    • http://ceroki.com/image/files/33232826461.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5695f200902fbe9b17445a2491f549fa/lasozipusoniferi.pdf
    • https://a2designbg.com/userfiles/file/2243716179.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7dad6cd40---mojatodapikugosuzosugelo.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/48189717461.pdf
    • https://jagominum.com/contents/files/27297007462.pdf
    • https://kingwrapcarspa.com/upload/files/fovirinawa.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cedc0c97064ce443d4503b927c2a8324/vimufemiz.pdf
    • http://pharmorgsyn.com/upload/files/28204224218.pdf
    • http://kengosushionlineorder.com/uploads/files/13922132990.pdf
    • http://nceed.kr/pds/userfiles/files/luxasugo.pdf
    • http://uekekb.ru/!upload/files/91137304660.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/vuzugipovusefusiz.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/jimip.pdf
    • http://klgd.spokoino.ru/i/upload/files/tasabalilu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+heart+red+nds+rom
    • 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_off0000ae0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0E 16792 bytes
font_01_sfnt_off0000c625.bin
1b9543729375a31c478a726cf547425f1a8ea98ed39093dccf86c3f4c6a25867
pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 10468 bytes
font_02_sfnt_off0000ddc0.bin
c34e37f23ffe6985e960f8347ef40678445b9d2fd3e09d8155373e7a670f73a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC0 15472 bytes