Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bafc762259724f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 05:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a65760218feab118bfbbd9d89cd71abd SHA-1: f82be5e6e643e1ce0bad92d9d325d70699576d5c SHA-256: c1bafc762259724f569a64908d04df86a781a43494ffbb48afc236fe71165e6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to numerous distinct hosts, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://m-camper.ru/ckfinder/userfiles/files/95597662934.pdf In PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/wisodijetetukoputekifi.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/fomimubadoxurun.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4dcd88506---4347611118.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/70498988893.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/65502181674.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0d6121e7b9897d0e1151e460b0204c9e/3339635686.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/480b8af8c279b4e7af4cc5776edb88ea/74781351544.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/34082694347.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8d06922cde8da0aa04e5d7fbffd2604d/53830365686.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/33840417579.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jixunerim.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/donubeputugokeperazisak.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/dekofifozut.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb8b95579---tozufariwaje.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gk61gaas55f5k7dndh8gvv33u5/wedefer.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/tewosapulutade.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7fc370977---77800157124.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/3567172311.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210714134439_ZGVmaXZ1amF4b2JlbWFu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc39a7b92e4---3837139504.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/19901092381.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/dufukarasibunipuji.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/45211438762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=english+dictation+words+for+class+6PDF 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_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 10860 bytes
SHA-256: 400d79b7bd7d313c0b4b25cf8c0441d349efcac35a7027f8bd88fa0368ea40da
font_01_sfnt_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 18324 bytes
SHA-256: f49c6cc7d5e7b2f0f7cefcd555642af5cbfb610e3251c9d28b2aa05aa0460487
font_02_sfnt_off000130a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1