Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca2e3bad6107063…

MALICIOUS

PDF

85.9 KB Created: 2021-07-23 22:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 11c173dee883b4889c079c8db991e623 SHA-1: 10cf511e17af9fbecf391374745aaf15a5f8f2d5 SHA-256: 4ca2e3bad6107063c610bf24430c1578b6efa9063d89d5d3885e5b8cc8244531
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to domains that appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://yalciniskele.com/imgup/file/87429763063.pdf In PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/mogus.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b085131f28e---tiduviduxogulixuzosaxore.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/37019993602.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160872ea4ea045---4863127229.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c41457fb064d4c644495750f547b9951/rudelusotekitinafizudos.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/80961572997.pdfIn PDF document text
    • http://allycatering.com/userfiles/8597851376.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ae4ad5422---20849575710.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/lenuroge.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e12487fdbc14fc31b3ca739d810d37a9/81028509625.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/gafenelurejibebosivewis.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/48957894069.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0163e30e0725a728de0298322dc35344/94810990908.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b5d3cd882b8---nisedurar.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7f4e2dbcd---zudobiwamemif.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/wuvefelimul.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-13/20210613121901709753.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/27603314762.pdfIn PDF document text
    • https://nasikampung.info/contents//files/zesamuliminezodete.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/modafoki.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/fanavidubo.pdfIn PDF document text
    • http://safarang.com/basefile/files/56955900172.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/wivopejovuwite.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21e5db860---kodepufesizivirinun.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/wafometaminilimaji.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/r0qkbn9n76rtf01hvvbiagkj90/35197538128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=organizacion+funcional+de+una+empresa+ejemplosPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 11180 bytes
SHA-256: d2a354429eda4c898dd22d54afe622d810f488ac920185ab37ea57fd563d27bf
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 17900 bytes
SHA-256: fbce68646e3429b0698188b9090e9aefc7883cb248b7819100a95afbbbe3449d

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