Malicious PDF — malware analysis report

Static analysis result for SHA-256 a207461c520b5c30…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 05:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7eeb5f63ffdb4694fc38eae67b997a4a SHA-1: 719bb42d942627b2b651642ac7a9286e9c51df90 SHA-256: a207461c520b5c302bee359bf9dbdb14a5e611590ef762f1549d7209ed0428f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to compromised websites, including WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.andreivieru.com/ckfinder/userfiles/files/5989289315.pdf In PDF document text
    • http://czerwoneiczarne.pl/files/file/59264104968.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/ripanaxowegokozawineb.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/69198143037.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/7830621738.pdfIn PDF document text
    • http://cnispgroup.com/filespath/files/20210924050211.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e2pqk6r46t4m7aa81803kel3c2/59750915251.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a5546d18---tixorufovopakixoxawono.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/32405928520.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/33419163ec3d8eee79d42625085caf3d/sivivixo.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/tezaxiwusudoru.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/18532517666.pdfIn PDF document text
    • http://www.miwon.com.vn/app/webroot/uploads/files/vujegilepokav.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/14174219583.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sawutefovip.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/53152319283.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/pevikasuteliboxadu.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/6163190695.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/gejenomewefa.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/nedazo.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/tidunifepafisalege.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/juvodapuxezo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ac6t5coabp2phsupev5b94dfo3/90693374222.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/59972631663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=mononoke+hime+watch+onlinePDF 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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 10396 bytes
SHA-256: 8b1b924b7b0c32eedc05a95fa65128278f66776ac2d03cce162516419d1bbddd
font_01_sfnt_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 15068 bytes
SHA-256: bf62344f142e68e02401bcfb0259d5e7b240258739fc45e97bf3bf148a2fba87
font_02_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1