Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4badb91b4efa78…

MALICIOUS

PDF

107.9 KB Created: 2021-08-23 14:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbf0d0b9214b0445534f3c884397f999 SHA-1: ef6c63e72115901108469db689eb25cd88bdec5f SHA-256: 6f4badb91b4efa788f4146635fa488f336a8ba70d381d3cfbf5047a7f46cb5fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://pixomot.ru/uplcv?utm_term=surah+rahman+with+translation+mp3+download PDF link annotation
    • http://alnoorcity.com/userfiles/file/92155720973.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/35321656017.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc749f06fc---duzotixukerovadozo.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/31421587512.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/30010193107.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/32008443576.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/edj0g326ovg7n74r05m0urn5a2/damalofanepek.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/sobadepedozuruno.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tt40uou5hr7ptt5q27hat9qiq7/zonemamegorajezadirub.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/87667894790.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nagedizalekuvigo.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/17109779648.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/vavepurusexo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b5092d122---zelofuferejutupem.pdfIn PDF document text
    • https://mszukam.pl/dat//file/jufiwag.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5341344610.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48a47170e1451fdf2576095ae7ae0ed4/vuwavawameje.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/duvakinofumadu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e68d2a090b7e928a21950d5326b923ad/69697394163.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/bipilijexun.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/43971094351.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/86840704196.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016546.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16546 33556 bytes
SHA-256: 41e4403db0f80558fa05cd9b6f0ebbb6bb36aae323f625ae4e00db6288c10cce
font_00_sfnt_off00010558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6F 10960 bytes
SHA-256: c60c8959d02887caa9cfa631144d416a2a0819a812fd2c8988a716b186a84a21
font_02_sfnt_off000136ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AB 17856 bytes
SHA-256: 6c393a90ec3dfd26b5b4a39d9c28cac87f2b05e9cb4d049262d5ce96e1ea0a2b

Open this report in the interactive analyzer, or submit your own file for analysis.