Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e58ddaea63026c6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 23:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f83f817a9b805804074f60545c0d8912 SHA-1: 3e3fb4cb9a5366755b3197d390cd8229e3b6e06c SHA-256: 9e58ddaea63026c641e8b1b4d4a3637d368caa33cfe994362b8ed15909f00fcd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to compromised WordPress upload storage and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://www.sauminandy.com/fckimages/file/jovojonoweduxeni.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe1fa8ac7---57439715122.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/bejelogobedu.pdf
    • http://jungam21.com/upfiles/file/1631217411.pdf
    • http://bjbtrh.com/files/pic/file/62835844035.pdf
    • http://photo-preiss.com/upload_files/files/naxideluzuraduzu.pdf
    • http://ipceurope.be/assets/file/posoweboben.pdf
    • https://mingyi-lock.com/data/file/userfiles/files/26754549443.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0e2e7813---dipelomewa.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/83728351980.pdf
    • http://studiodabo.eu/userfiles/files/javuxezilexopavi.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/97479030877.pdf
    • http://ecoevopublisher.com/files/upfiles/file/rubawisobubenexojaso.pdf
    • http://deshdunya.com/blogimage/file/72029068547.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/65257217154.pdf
    • https://pioneerlift.com/upfiles/editor/files/56090698438.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/6e5a5bf0df3d22013a604ec97097a14f/renofapuwusap.pdf
    • https://nic-irq.com/userfiles/files/tawakofipuxifazobikadugef.pdf
    • https://thefencedocumentary.ca/adminfiles/file/24627290918.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/68043070581.pdf
    • https://ngonluathan.vn/images/ckeditor/files/femanoratunajosotifitod.pdf
    • http://n2nnetworks.com/files/others/ripazagino.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ada007073---tasozabatanafamum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=como+configurar+email+no+celular+android
    • 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_off0000cfa4.bin
2987ef806c8d245fe53c19a040dce128ab941cc23b8a9a4539e1168997ef145c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 10684 bytes
font_01_sfnt_off0000e7dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
font_02_sfnt_off0000ffee.bin
d72755f97e2e3337c9e45385d19db98cedaea441a57462d77a15c0a4f917a7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 18268 bytes