Malicious PDF — malware analysis report

Static analysis result for SHA-256 573d9c9959820351…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 01:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8559d567b36bb8e0a533a5c16798c00c SHA-1: 56e6defae9ca42cb1a3c0ddac9bd074cc742ed99 SHA-256: 573d9c9959820351efe733a5905175720a96062223260738427a3b6b031b9a3e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • 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://totoquynhhuong.com/upload/files/79993116942.pdf In PDF document text
    • http://qunjl.com/userfiles/files/41928560980.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/71429154032.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/fubezud.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/3825491204.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/kexikulubupuwa.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/womumigifufivowideti.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/48786012981.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/23574818719.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631314024.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/10914361140.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/97150883641.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f113b153ac7e6f1dd7609ccb3061b855/mekukura.pdfIn PDF document text
    • https://orrizon.ru/images/file/31401210253.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kuwomipila.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/65358108800.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/satomiwevirigibadoni.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/95764053434.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912152741902985.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b631bbb8---13253260433.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/sukazomoba.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130300774dda---kovisumurupuguriw.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614194bc78161---xuduzofowajuxurufukapu.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/55070929880.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/sinuvoguje.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/81609080084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=who+is+antigones+fatherPDF 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_off0000b35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35F 16688 bytes
SHA-256: 085eebd45157235ceb2b4622d3a684f79618e34fe8bd77bb6ba4abaf1881f2eb
font_01_sfnt_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 10440 bytes
SHA-256: f0b3d53995405faa9fe95f8bfb5a311b659915c7d8d6a9f901e38eae4f0a14d6
font_02_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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