Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5a678cca69a8e0…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 15:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46c9ad46944046749d90dbef342c0a68 SHA-1: 41eda1bd48e7d443dbdb79d96a3ecda358ad86fd SHA-256: 6e5a678cca69a8e07114b5dced150ae8217bb8825aec6a3440588f3f667e3718
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/1c43232513d981cea2ff30d8ea681c0c/supidawelalipebotakajuxib.pdf In PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/36140565380.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/67836139623.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/63538591834.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/58502166155.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467eb32a3a---zipusixujamidi.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825849f57a---sokexaloxirisokalipaluki.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9d3d87ed67e8f41b3914552a5c36c4f1/11597671138.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wonajasokek.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/80b8964d45741323acd2fcc15c66f7da/dekowega.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/wivujisiwise.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/34350636203.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109060403495455.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161366d7879aad---60124875079.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/87898483706.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/51822260078.pdfIn PDF document text
    • https://songhongresort.com/img/files/5612846529.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/95594952617.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/27041349400.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/13791950860.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/fikadug.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/26637622506.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/85729240314.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/ramewawaxobave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dream+league+2019+obb+file+downloadPDF 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_off0000b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 11220 bytes
SHA-256: 144608486c4c26a09776879d14a4e92eb5da9fcbfea722d99fe91cb6092d1bb5
font_01_sfnt_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 15748 bytes
SHA-256: e81af252fc093ae5fdcf5c1e95ff5c858084a79ab5a85fdca26a13b758643d1a

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