Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d6e0e309236db7…

MALICIOUS

PDF

81.4 KB Created: 2021-06-25 15:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f5ee817f8de58e3a554d206d6bcc17a SHA-1: b7edc89149e4b080c8e821486fb7a5d57f35d019 SHA-256: 13d6e0e309236db7cfe52ce196fc5d47ffc02b47b1e4aedd774665bcaa63fec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised websites and potentially disposable hosting, disguised as a source for free infographic templates. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=infographic+template+psd+free+download
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e3a388c3---mewem.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2e976cf0ea968e7c4a76bdf1bba9bb8c/60864780944.pdf
    • https://mldom.xyz/web/img/podborky/files/76128938299.pdf
    • http://czpohledavky.cz/userfiles/files/sevavikimajalibavag.pdf
    • http://cualuoiskydoor.com/webroot/img/files/guzorilefazevubu.pdf
    • https://ebooksweb.net/files/file/wulojumivewuxurux.pdf
    • https://unosms.us/userfiles/file/73542152609.pdf
    • http://enotecagaribaldi.it/userfiles/files/23058626970.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b6b7677e1c14461589fb38e0a787c109/pivekarufisewi.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609165029f788---11001804483.pdf
    • http://homenet-spb.ru/userfiles/file/31386219176.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae995a275---63372197492.pdf
    • https://villanakarin.com/userfiles/files/lusuxeludetetugaxix.pdf
    • http://odpadykj.cz/UserFiles/File/ziwirikakapewones.pdf
    • https://pachetedeturism.ro/images/files/98928054414.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c65089af6---kukomoxorubitogawof.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/76239942479.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16792 bytes
font_01_sfnt_off0000f13f.bin
09d210582ea039b91c8bb4bacdf68f8d616a4dac85e55d274f61612b417a505b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16920 bytes
font_02_sfnt_off00011d81.bin
3922d731bebf805048c26eb85af747a30d61cf92d2c8e49125427b473d180b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D81 11104 bytes

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