Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd7c47ff50a2bde…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 14:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aedba34ef47725185bef8ac61e2d133f SHA-1: fe69f4d137b4fb1d7dc17bd3d9afc95b75a4be02 SHA-256: bdd7c47ff50a2bdeefac144364bad49d696c051c74d8cd55ee7ad15984fba54f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for further exploitation, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://briljant-maleri.se/UserFiles/files/gimabopepodutobodub.pdf In PDF document text
    • https://jphotographyllc.com/userfiles/file/tafuze.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/mefagazenizi.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/p6auvikbn07bus7ojii0i3jbg0/13803914848.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/68316675585.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/50863297559.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109200628129869.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/8342101935.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9833d117---52103281405.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb4c3adbc---51628231183.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/19802603539.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/kowojemonasato.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/5e5a348843a358cef097f8d859435cf9/fuxojusizi.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/85429787655.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21091516555182792235vgx.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/4996199815.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/wugosegejinugaj.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/1515546928.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/nasilojolasit.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/vifagisivafupox.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/xunizaxutajodudisadevun.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/goxopeju.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/14333205225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+premium+offline+games+for+androidPDF 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_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 10996 bytes
SHA-256: e35754b86c4f51d870981d1257fb4da7e7b5fb60fc2d216cfb69485d23d92e68
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 17908 bytes
SHA-256: 2bd42da5b6746b6d58c24e72506a68fc6e2d0ee406c83a1e20c03caefb01c015