Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf46d88da6dc3e26…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 01:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 902d2bae461d74fb7763bdbfd54c5580 SHA-1: 971139c585a1427cb2cc7f869083eda8be9c97c5 SHA-256: cf46d88da6dc3e26d3efacf7c6bbfe8d510bf77498dfa1ec7f8f01f1cee848cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://chcial.ru/uplcv?utm_term=societies+act+1966+malaysia+pdf PDF link annotation
    • http://tetrafluoro.com/upload/files/nopevelefagisu.pdfIn PDF document text
    • http://greenbrier101.com/userimages/ravuzepati.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/44458633039.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d3f57a05---neraguzawixijofagab.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/gexerukutigavupuzutel.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/48552808536.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91340467887.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d66014f3---19417153010.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/fajatepuliz.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5816c3c5055fd9b8f15f6823fd57e06b/vadutoloxuferikowedatadof.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/23075246924.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/28011111464.pdfIn PDF document text
    • https://km2804.com/ckupload/files/68928456078.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608c526aca936---38492403475.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe7dd70fd---revuzire.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/57876491324.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/38902683202.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fi07p25ndrskt9ur164oc2k9t3/zegor.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc06fa33a9---67093402953.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c649531cf3---67376911820.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/45726449972.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/90018543473.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc986b983c---3175271317.pdfIn PDF document text
    • http://trungtamgiasuhcmmq.com/uplaod/quangtri/files/xigidami.pdfIn PDF document text
    • 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_off0000ce3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3B 16568 bytes
SHA-256: 198d1af1c363b96b69bf8f5816930d5badc19f8eff47c0fdfab7c7a6470782c5
font_01_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 11152 bytes
SHA-256: 66583e7daa6692443d6c9ba8773873bc3cfc8e7d99d0816b74e4dd92cbf386d4
font_02_sfnt_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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