Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95402695b9e29ac…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 03:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29921332821cb4f3b6657b31377602c4 SHA-1: 29c6974e1c34185791abb4a2c5a7a6a4d4221a3e SHA-256: b95402695b9e29ac2eb39eb8edc7b49995c70973d47a5c2a40e00b63cab65d4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • 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://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/fikenexima.pdf In PDF document text
    • http://dream-mebel.com/pic/file/9599610179.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/lukenuribilerikubozo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/vutoramosukejanakat.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/6015966888.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/39995584772.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd17bfa10---vodojutib.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/70349848701.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/nilemeretevunixor.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/rexatagu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5334d320---49938859918.pdfIn PDF document text
    • http://platcometals.com/images/file/33897120841.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kejexapitesetixinedirato.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa2f126b5---69007171650.pdfIn PDF document text
    • http://air-con.ru/upload/files/48573939262.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nawutorofujugusew.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/kejaxuzurexu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130817018883.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zaxolelegaw.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kifivujatafekukisuzuvoju.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197109343224.pdfIn PDF document text
    • https://camphacement.vn/upload/files/kuxaluvonoge.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99684435547.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/meluputujipu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dujipabupepigemo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/55991477773.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/32828075356.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lovunelepotanexilup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+the+quadratic+equation+of+a+parabolaPDF 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_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 11012 bytes
SHA-256: cbb755133f857fc2e8da6cd2edb5aa95c9e73f9958388f3932de4e8230e5c9b7
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16688 bytes
SHA-256: f8a5161479e083cd43f8486bb36acf34edfc290bde3fa782312e381593d0348d
font_02_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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