Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7c09bd65cf05eb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 04:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08f9e42ac1ca151e609b124f9f52ecb0 SHA-1: 2707a4e401d35be72cedc152d6a79f1f255e8f77 SHA-256: 4c7c09bd65cf05eb68771561518c44fa41758305369c8620f6f474fd4bdf5e28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://easy2ticket.com/upload/files/mujegevoduvefobatanaxemej.pdf In PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/32420794025.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/55510104466.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/5388111092.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/78167de0214e9820c467f2b92b47b58a/31283197380.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/gexilikadil.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/ninupowe.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/41b98033e2ad512b7bca8a2ac980c3f6/220164982.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/wanofenakigizezer.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/7968402475.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/93504634433.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/sabugozudol.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/54995458709.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/lewadununotetofevekitu.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/wovoparenigime.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6b23d32158532386566dcfa9a1da1ca2/wizikalokiz.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/bulob.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/gogamekik.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109180252016209.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/47930918461.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/80716412867.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/sojanepomunegufilag.pdfIn PDF document text
    • http://stylekd.ru/files/68548837248.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/duterexipewa.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ubojugozus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tom+mod+apk+android+1PDF 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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 10216 bytes
SHA-256: 9be5468501660d3031e003d7ae2b119fc1ef7ad9187db08b776161efebd00ef6
font_01_sfnt_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 18648 bytes
SHA-256: 283d1838d19d799a35d561380d01f793469c71ecaf75c362f466803c6a96998f
font_02_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1