Malicious PDF — malware analysis report

Static analysis result for SHA-256 6256a97d3ff9c94a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 23:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70131c533313b652b731d05624f9db67 SHA-1: 469887e0e6bb4d6b893e67386fca462fb5615fb3 SHA-256: 6256a97d3ff9c94aa5ca2a70aae7c5b9a24103b0c375894ab2e14021b1999f7f
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to a link farm composed of numerous URLs hosted on compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 http://prograsifkalip.com/files/83926249852.pdf In PDF document text
    • https://eko-briketes.lv/userfiles/files/15102956520.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/bomibekibajakobazulam.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/wizetoxupalonu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4cebf9656dd6d4e2337d0c421c4f172c/vitiwubu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17a3aa27f---75289466730.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/takefomawi.pdfIn PDF document text
    • http://vucert.vn/uploads/files/98011083377.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/ziforumoxizasesogirisawev.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/10757606813.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/94849254438.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/jowul.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/xodisogaxexuvex.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/dixogadofip.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/waluvotuzunonebabaw.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd49bc3da7---kabave.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fddcabe91---98883748931.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/65244760950.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210912191834_0g7s6g.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/654e2773bf87c785cbe68c3519521e05/janasimevufap.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/29309928015.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/bilasabowuw.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191219658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=x+recorder+app+downloadPDF 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_off0000d79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 10240 bytes
SHA-256: 7e5c1738bbdfb1d4d41ccc4888310cff2694d03795732b8af3028884bc6efcd7
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 19668 bytes
SHA-256: 054fcd4d5e11b6dd4e95adae0a2f2fca515a1a07f4b5a59e5a2d160d319f8f75

Open this report in the interactive analyzer, or submit your own file for analysis.