Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dd88689ff080b6…

MALICIOUS

PDF

73.7 KB Created: 2021-09-17 07:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2f66c711f07a6d3b2981995cff1e5fb7 SHA-1: ae5d4fc4b889a3c46f195eb0c5dd36672046734d SHA-256: c9dd88689ff080b63f0040b2c7a1ec6e3bc93b3f13faaf56333778f1ae306793
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133382eb15fa---tivubew.pdf In PDF document text
    • http://rialta.ie/userfiles/files/foxefugatapirizu.pdfIn PDF document text
    • http://195exim.com/datas/files/razedinesagatebo.pdfIn PDF document text
    • http://bearings.vn/images/ckeditor/files/kakezumegigimolusamevuki.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/58374263794.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/18089724526.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/fawojapepelubuxiz.pdfIn PDF document text
    • http://manu-transport.com/documents/file/vodejonasukovemotosefo.pdfIn PDF document text
    • http://e-sheremet.com/img/sajoxesefejifalakavaso.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143a6a16e895---tazowavutewakakuz.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/kidobelever.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/sutoximefunadofuzujarude.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/68976340896.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/valamuwelapovuxino.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/takidu.pdfIn PDF document text
    • http://labradory.pl/file/resotekewopamatugopeg.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/nejilulomejoki.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/86993471122.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/nowanawelagadojugimorika.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/ponekip.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613639a57bc08---32988818614.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/71020122101.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rilapozosimotajemufu.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/vowexuwuwigakuzoz.pdfIn PDF document text
    • https://digireg.li/upload/solipiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chrome+save+bookmarks+to+filePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 10704 bytes
SHA-256: 47ccbba0a13e8d8a6d988ab0560dd3e56dddd90502f52a8fc610ad587be2760c
font_02_sfnt_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16776 bytes
SHA-256: dc656f89d67dd2e10e4854770f0229b4bd88d5d5b3e8570d934009851b33b3ae

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