Malicious PDF — malware analysis report

Static analysis result for SHA-256 54efda116e338cb4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 17:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b0b7437081f6baea226ecea96fe59da3 SHA-1: cdb2f0c0bdadcd8501e020a8a4ac59280030bad3 SHA-256: 54efda116e338cb4f389b9adf3d9d8c0e8d8edbd13f05e73fdbebe7897bce448
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/b5d0df420f69a8c8e349a46757577e8c/liruleraz.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/zoruzepumanukel.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0da850b1b---55095459767.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/25df72fbf8734ba3bb3b4c2896b35f36/wupelifolerefovilanagu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dcb53f5c1b83512ad8432d935fe671ff/fivusik.pdfIn PDF document text
    • http://ridendo.cz/files/file/91863303102.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba324110f33---93252766019.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a543c77ef---25446381455.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/43881291661.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/nevofamadit.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/40162812063.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/be6ebdb8f63af621a1be0bc46b366148/baresuvinarog.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/82589738340.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/meguresu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mqknm9tn288gva70g1pi2h29n0/negivuxifinululu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5ee99f9c26acfd6805a5522f021abd4b/delanoraxez.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/gelidizabifutaxob.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fbd09b86efef6328f426c68cde30cc5/10313046197.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/15201372158.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/riwonunomuxazaxi.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee3d43c08d---77850479140.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6791fb0bef---jatagupelufokuzuno.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210808230354_sn0ckn.pdfIn PDF document text
    • http://carszana.com/image/upload/File/tarotir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=comparing+decimals+worksheet+math+aidsPDF 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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 11172 bytes
SHA-256: 5f4db1696ecdc9921b01cefc556e3a361be9b4115a98ab07e353d85e6268fcc8
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 16572 bytes
SHA-256: e29e9a9f59cf360d121d9b9a21c53511eb01f19e774e03dcf6d7757feee9cfab
font_02_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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