Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07b6109ef32f456…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 16:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab97edbf5fceccf5aa0e1b2c730faf4a SHA-1: 5cb26fb71d9bccc8b5ee23d0119e1e804eb98397 SHA-256: e07b6109ef32f45629116c7ce01a0c4e77810adc0b37909fad1a7c22b23bde24
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern is commonly used for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=yacine+tv+for+smart+tv PDF link annotation
    • http://wronba.com/uploads/wysiwyg/file/fenijivad.pdfIn PDF document text
    • https://eniedu.com/data/file/20210902050047.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/31089231169.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/gilukavowima.pdfIn PDF document text
    • http://micruts.org/userfiles/file/28301240838.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/74689464504.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/62773718482.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e7f065bce95b85d139552cf095c18df5/kupatojovexefi.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/kabumuviv.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/9941196101.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/46593876301.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/9195030235.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/lavudasotowego.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/77779016832.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2m0euk63rbh4ntmrgbjdt8ohm1/fisoxadadokif.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/54356384680.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b050e23a6fe184a395517494565aaff5/56144754158.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonigogikefaxikekurelire.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b4ebmcne02kreopvtrld817oib/61013933059.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/14649733892.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e43ac6c5a---93411201619.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/37720105372.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/karovujubuwokolibijipu.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/parujerubafaroka.pdfIn PDF document text
    • 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_off0000c063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 10500 bytes
SHA-256: 19a7c7fd57fe6b86eef2b78236ca434685666a87f0db436338e2ea73b8b7e0de
font_02_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 20808 bytes
SHA-256: ea6dec282eb42537fc00950e04d9fb492150235a4d5deff7d3c9a140352949c7

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