Malicious PDF — malware analysis report

Static analysis result for SHA-256 f628fc8f79066e9e…

MALICIOUS

PDF

70.5 KB Created: 2021-09-26 00:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b6d0a1c0456b9a6d01a75d6f634fae9 SHA-1: d81ea8b4772ada85e2e6163e4ec43681153363d2 SHA-256: f628fc8f79066e9e3d99d00098858e93fc0cbcb3c058599eb69151d515214a2c
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves exploiting the PDF format to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/025d8b7f5013bed20ee31f8b4d6669ed/20343114823.pdf In PDF document text
    • http://geoscan.it/userfiles/files/26994045556.pdfIn PDF document text
    • https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/24330397670.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/nebelobe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029ae56b62---rujebolavibo.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/22509334899.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d72fb8f5adc0a5a3cd37a1cc9dd130da/63070629011.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/manodu.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/sujelinironu.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/70759828322.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qptsh9r0c6ecb8r2aou1rfmnpg/9641224904.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210904_10B621BB873EA683.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416415c596f---13829898878.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/39917430626.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a8bf0e1e389a5af30a4dd7f43f9fe425/43282626776.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/12934722076.pdfIn PDF document text
    • http://irinabailey.com/upload/files/87957387186.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/32735013243.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/visirowanefun.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/14583879727.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/rebenijugele.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/baxomefovegofelijixos.pdfIn PDF document text
    • https://yasacompany.com/upload/files/pitudutexomumiwedojotirib.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/jexamudigi.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zelilusuwimojeme.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/846425314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rugrats+search+for+reptar+ps1+romPDF 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_off0000b3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 14632 bytes
SHA-256: 90f5a07898706bfd1ec6c3e7cee651ea87ba0ebd0967bbf981803121a5da3a53
font_02_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 10880 bytes
SHA-256: a4b91a3cfebde043f1df3d42b9d0adc575c76b5fbeb5f8073f16de4329a8261c

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