Malicious PDF — malware analysis report

Static analysis result for SHA-256 a404d2a8e0a279bb…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 03:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1443f1100676f713539d282c7c843d07 SHA-1: 1af376f0fb56841d80b2b79e8e18e50913c6349d SHA-256: a404d2a8e0a279bb3c045353f425ffad692268471e5971627b19b107dc7d62f7
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. Embedded JavaScript streams are present, suggesting the execution of malicious code to facilitate the redirection or further payload delivery.

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 https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s2ccaco2jc1o02e3f623o3orbl/kozisulexokir.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148d72ac1cba---32239476609.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/60836814824.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435fba21fb2---ratalid.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/1533395808.pdfIn PDF document text
    • http://computerdoki.hu/user/file/44777435565.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/91044676999.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zegapavejovoz.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/bezega.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614950f6158a6---40405684190.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/32962452472.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/fenujusozafovidu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/456612466.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/95076924780.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/zavenoz.pdfIn PDF document text
    • http://elsped.hu/files/file/bexapetuvagubadixuwolu.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/madijapanikagu.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/modez.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-19/images/files/lenirotodudofujewedu.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/90880d18b7373b188ad78270fbff7701/kogakelatokamimepebivitub.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/nosilawezesesu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/99136344360.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/60516429139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bar+graph+and+pictographPDF 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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 10500 bytes
SHA-256: ce3daabbee3ebcba059fad58e068d32de77e115a8f12845cc7122ff386233be2
font_02_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 17408 bytes
SHA-256: 4edc2a1634d6d6a4c0ef6a983d18383e8e79405b114bf88d7558792c75ce83d9

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