Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f226150d2648a9a…

MALICIOUS

PDF

148.2 KB Created: 2021-08-09 02:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16085f930525ddd65c878b5fa562394c SHA-1: 87a17c20c466b8eb0f31c3dfa0d57cea59776dc1 SHA-256: 9f226150d2648a9a208f3ff9e16144b04b51c3759af38fdf64c81b4b486acfc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The document contains numerous links, many hosted on compromised websites, which likely serve as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading malware, potentially disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • 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.
  • 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://tumwebthailand.com/ckfinder/userfiles/files/98337494.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ua7fvivbe6ecdi524s06hst9oe/99623315873.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/robaduku.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/t7o4rivu6qff59umpoc5emchq7/menojakezojujo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb5888fd51---sifidoxapiwasikalevim.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/vekuxubiwotubosimifadox.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/74128546125.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d395160f9---pizobofuj.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/kcjgk7e8vr99s809uhoe5j4qu1/7257798627.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/upbbopp31032dk41bnikkpj38k/tonizilunor.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160962bd08e092---9544072802.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/dovixaxuwutisos.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kidiwimelozojagafujura.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/64300214689.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2e4c00e04e68dab28fbd256f36be52d7/vuzamavip.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/biwatejupexebe.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/87096d4e02233b245c7cc4c658c38c42/60538590726.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4b9ed4227---63551717364.pdfIn PDF document text
    • http://1975geegees.com/clients/78603/File/96364804148.pdfIn PDF document text
    • http://effektfilm.de/files/file/85340330520.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/191351084560f58889c3788.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kupolovogiguzukorefor.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/23390360514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=balarama+mayavi+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C89D 2900 bytes
SHA-256: 49eb4421dd4b82acd90fd1c9831bacbb77a0005d4f6fcb6401f9d19282965464
font_01_sfnt_off0001d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4E3 24340 bytes
SHA-256: b8d4509eaf8e05324fada2503f2f308b21d2ce37a2bf0fc3e7b02f574870a552
font_02_sfnt_off00020fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FAE 10712 bytes
SHA-256: 51a7db8feeed6be1fd88329a716c9e162df99a4b322ae590b061ca79ac29f21c
font_03_sfnt_off00022849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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