Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0f10b4a1568105…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 02:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c0f72af5a1206e0bac92495c5f5e4c5 SHA-1: 7619208fafe759ccdf66566046399bab257ec8d0 SHA-256: 8f0f10b4a156810543b17eca6f1583002b8a55a583207fd202c6f1ef209f56c8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics indicate this file is likely part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9b16572a6---zibita.pdf In PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/zomojupi.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/88127999171.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/62891690298.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9tuoetts2070vo5e5s066pegic/38608114289.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/95788140432.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/78558601164.pdfIn PDF document text
    • https://patc.fr/imagesfile/kedazemuzukewimapofufo.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/45550071913.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/3fd933007c0d44515622024ae7a6328f/13290934406.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a93a40306---zelezinezavewej.pdfIn PDF document text
    • https://kopari.hu/files/file/zujinexuva.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a660233c419---21049623787.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/30541815078.pdfIn PDF document text
    • http://accronline.com/userfiles/file/dulowojon.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a667e9c224c---kewam.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/53257843737.pdfIn PDF document text
    • https://energooptima.hu/upload/File/85016215241.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f14d49230aa---56014331800.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e73602f95e6f18f971342adfbc3f04ce/jemezu.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/77986071203.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee090b19db4---69635363304.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/34502333827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=hachette+livre+international+pdfPDF 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_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 10604 bytes
SHA-256: 1940ea9e5c04a93ab5be1ab17fc570f51e701fb82c3ebe079bad2f0f974313ed
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 18804 bytes
SHA-256: 6b474f81655f2c7454e978469fce27d38cd5f3c5f72651782e8e6481e3721505
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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