Malicious PDF — malware analysis report

Static analysis result for SHA-256 16514fa947278308…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 03:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 307bf5d77abcfcdabb8dd099841ccf9d SHA-1: 0f620bb2d597acb7a8970048b94eb465228af1b1 SHA-256: 16514fa947278308a34d75cef78502f0569d0bbae8ffc469390f08e8a2368bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rimsball.com/ckfinder/userfiles/files/zimafojegu.pdf In PDF document text
    • https://mmszke.hu/files/file/xowesawovezozixigixaxosi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/sifkdqnbe10fqmlk1geb12r6cs/zebetadoreditowenigetuko.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f8de107e---lixefotesanetuxomo.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/nadejaropugufagazufituxob.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/wewafapoke.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/72452102860.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/bd9217072355698154d680cd44b16719/zefebiwigusugumifakejipor.pdfIn PDF document text
    • http://myesen.life/userfiles/file/fusokedizoruka.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/wubam.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pj0mu3t4f00ou1dlh781cegvg1/zuvibarokularanutom.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/39267663083.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/xojeguxogiwevemunezix.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/28774096670.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210607_F4AE557FBEDBD60C.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57431231d---12374264168.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/rasudibini.pdfIn PDF document text
    • http://salt17.com/userfiles/files/vefiz.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/73545124954.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/sizonatixopuxaboge.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8adb4543c---79794925363.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/77423404279.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/xudipexegobaxumuputekola.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/38676109607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=poultry+farm+project+proposal+in+ethiopia+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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 17676 bytes
SHA-256: efedf4db87d226826e935248a779cac6217296f6f564a5948c11cd6973e76648
font_01_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 11228 bytes
SHA-256: 406bb9283db00c9859d98c664c2092b5ef8520035e9d3fd5b4d02ae79fb52997
font_02_sfnt_off00012961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1