Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ff5ff31252f7a6…

MALICIOUS

PDF

77.4 KB Created: 2021-07-27 17:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 46c9dc25627bc2d1feca04af85f7d9db SHA-1: 8fa802ae5cb47add02006f3c89ac748203fabb48 SHA-256: c6ff5ff31252f7a61c7df18d14b74da6873f75652b439e1d4ba0d7b5aaf82e4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised websites, many of which host other PDF files. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bendhorseride.com/userfiles/file/sotediwabijomiwonokabam.pdf In PDF document text
    • http://hzqzg.com/d/files/76831961972.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ecd3c53ca393497b30cbfbd3530afb82/98785889447.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/c28a8dd0f91dc62532472dcfda40e32d/73717879182.pdfIn PDF document text
    • https://yasacompany.com/upload/files/83235163373.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/77778096316.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210623041531581.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mfmgl96vismfuotf4plrefrob3/bagozubo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c030fcf124---19486901564.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e1a0ac57---gilamixone.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b42dd9624---vevogitizojemupapulifek.pdfIn PDF document text
    • https://argumentua.com/i/file/94273530112.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a629b6487e1---81321622074.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/42104960097.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210626080135.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/47102817685.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/gomewo.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/xaladirobaviraxorijal.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cad9mdlqnqks6vkuf4bs9u2c3a/55728697025.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/84892232658.pdfIn PDF document text
    • http://texmet.pl/userimages/file/jumoxakasugosobaduw.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/41147221482.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160804694d6ad1---dogitokojeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+g+cm3+into+kg+m-3PDF 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_off0000cad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10592 bytes
SHA-256: 576cebeac000412fc19f2bc7dc26dfe0acebb34ca3457c878944b3f812fb4c2f
font_02_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 17156 bytes
SHA-256: 3c7756b3a69ab7b717de872e83f9d297eb78e1c44dc41866c84ca102d486d08d

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