Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7c68d2177459eb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 16:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c8adc4241348e933704713b228e50e5 SHA-1: 2789889e8ee2acfb692ee1e9974ed4cccf80ff69 SHA-256: 2c7c68d2177459eb6c7081f990a08fa6a3d74e5744b26140404d69701aa40a59
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 or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are part of a link farm designed to obscure the ultimate destination, potentially a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://emekyesiltepe.net/images_upload/files/17846619923.pdf In PDF document text
    • http://hamkr.com/userData/board/file/47739649570.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1cfc34f379e4223ba51ecb6b622d2c7e/jufaja.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/89054786586.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe2c4a5096bf6e75846b3aeb85c68158/48791767742.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/webejumuvitazejodazadomus.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zebetomawosumunoreroroguj.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/powopupevipiwusop.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/85006564874.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/2c5pi4bukpk1f7pc7mec8gvp15/49413466578.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/61994999215.pdfIn PDF document text
    • http://samtekelektrik.com/files/pedirixotuzetivisu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc3739b375---korofixidumabo.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db888942c---fujevedefog.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160791329ccb74---lanonumaguli.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/182ec5689031119bee09fb5b68258608/74356970736.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9e129b8a---81403819803.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b0e35dd72---12148539581.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ace19aa65bf---pazane.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/21727895202.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/78422240488.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160719fb086203---lojemugepuxoradanekow.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wuvipozejoropo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2017+honda+accord+hybrid+service+manualPDF 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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 17096 bytes
SHA-256: 8bbae9ffb3dfa576cb323b4cd26bf3fd4ad8771073a587e5f42b41ca70b5c89b
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 11204 bytes
SHA-256: 088097e4ee4d8aeff9afe9f4c754a8ebe8412c7cbd2069d0b2b6e7fc68c2c39c
font_02_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1