Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6db984174adaeea…

MALICIOUS

PDF

80.0 KB Created: 2021-08-16 07:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 904dfd37cbb108681af0fb331c703249 SHA-1: 8f0174feb24d2728acbce8b0f64c15c2f743bbd4 SHA-256: c6db984174adaeea87ffafb7cc5c87b7a74b600a3a36690ddab59a249832609d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, 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. No scripts were extracted, but the structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://cructi.ru/uplcv?utm_term=comparer+les+nombres+d%C3%A9cimaux+cm1+exercices PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a057c4b5c---nuturuzurotejizivezemikan.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ffc8f117---nanevujuxepigasapavilalad.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/cpu3r5tp7lma0g3gg2840l0296/komudinawuto.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tabenusebomediv.pdfIn PDF document text
    • http://kelvista.lt/images/files/fakunenalelonisa.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/6412027726.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/5146791605.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/pixofexofajabelerir.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/vemezujiwipokibumo.pdfIn PDF document text
    • https://nada70.org/userfiles/file/60179147199.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adb98f0b5---64575020997.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/faxapivosebef.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/31062968195.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/52442352238.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/91390114874.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/65147084157.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/58239057361.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/vawon.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/920b53104fdd0fc6e1ee7ed1cfb70c32/vavebereferifojovonolik.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f74bc52a57a6c17c380d0cfa6be02fc2/kuzubepiwapapasano.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ed8c69230---jefuderafisufopaf.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/44db52661b55b20de81561efe022fb0c/96910096736.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/tutulonelefoludigi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/64r7cq7tl178jmb0tkdg4qfp32/mositadalinirewazototinav.pdfIn PDF document text
    • 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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 17672 bytes
SHA-256: 6dac29c086e313dc8ecdd2e135bb07cfa85106c3bac36e123bb61deb06dc5d82
font_01_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E4 11156 bytes
SHA-256: 6f3b3805ea9431c8ae49b64ad5d529871c13fc4d14679168ba33b6cf413570d5

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