Malicious PDF — malware analysis report

Static analysis result for SHA-256 412fdd7906cd8189…

MALICIOUS

PDF

89.8 KB Created: 2021-09-17 18:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0b5f7c2171f5f0b52f5052d6fcf7b86 SHA-1: a05733b5976b8d3f006335982119d5b453e8b3e2 SHA-256: 412fdd7906cd8189242608eeaa7a2804d8f6703b3a50259c35022900ddde88f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF viewers and delivering malicious content. Several heuristics indicate the PDF is part of a link farm, pointing to compromised websites and disposable hosting, suggesting an attempt to distribute phishing lures or malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://geojeoceanhotel.com/userfiles/file/20210905031542.pdf In PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/gabelefoxiwedokux.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/29043718262.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9f675ef3---lurolagaxepezitetixurosu.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/tuzafega.pdfIn PDF document text
    • http://otczenacts.com/media/files/gatefaxiwejigofuv.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lojenemewaradelawuf.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/13516285604.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/54666553174.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rnrddevqcsaam4ucgee4cgml33/ziwajubewixetepidu.pdfIn PDF document text
    • http://renknh.com/ckupload/files/sudilumikakajenujawiv.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/60a35323825bcc0bbe87da2462b1d31d/45122587585.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/naluxazanijuli.pdfIn PDF document text
    • https://duvanco.be/docs/files/sibatasekugitapazor.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tqqfk5tdlt0vjg7mafmhuikhh4/94702608532.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/sukufe.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/53484637548.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142a74bdb4e6---mexalakazajutu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zetojagijitowovos.pdfIn PDF document text
    • http://hidramaco.com/files/files/42361933889.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/73072721180.pdfIn PDF document text
    • http://net-marketing.hu/images/files/36221484916.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/75198273615.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/40103786688.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/jeboromizesexunikutipi.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109100012556453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=merchant+of+venice+english+translation+pdfPDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/50020608356.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_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 18076 bytes
SHA-256: c4d89b10afd8a5ed0642a18da5df0e584fee411bbcd148ef6a062b9c4fa4fbd8
font_02_sfnt_off00013fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB1 10956 bytes
SHA-256: 0d396586d192f2417080683bd89145132e0f2d789a11bad08430050074edd76e