Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4219068e554f5c6…

MALICIOUS

PDF

94.6 KB Created: 2021-08-08 19:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 174e3b379d4611fe0dcae5b12199eb17 SHA-1: 16513c0b85d06047f9ce4fd7c4d96638577f5e33 SHA-256: d4219068e554f5c6bf91775a6e56b3fdd7b5c89781f906612493bfe06c46b591
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to distribute malware or facilitate phishing. The document also contains an explicit instruction to disable security software, a critical indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7fe5693795c04924f5dd64de8bc672c4/73493095641.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/svutmcg4br07peo1squ22d59tv/jofovo.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/zupanojim.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093b6751ddfd---86400689174.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16086c3afd356f---3354496717.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9e2904270---63131671539.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/mofuwufumozevulis.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bd427acb2---9081533384.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/tuvekepobumejejutukovur.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/marixizafetiro.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076245db8ff4---papopupakojetirovifi.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/vokaxokozevozeriba.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c574d081586---9599889032.pdfIn PDF document text
    • https://digireg.cz/upload/finedeminixiwixo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d608bac4---mezogimekaw.pdfIn PDF document text
    • https://ancoraeducacion.com/images/dibosuriwekizatitiz.pdfIn PDF document text
    • https://designclarf.it/file/suziguburefemigugewa.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99340e8341---resutewigugukexipibogil.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/dfdbovur5apnf47ntga9i095u6/51712083804.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/33605041366.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/67882801757.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a44932656---84522904448.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94e66b7db151f9e62a86a7d801d6cb34/luseb.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c566ac84b---pupikanagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+iv+game+free+download+full+version+for+pc+windows+xpPDF 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_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 11356 bytes
SHA-256: 6b77fbf524b9bc0c4b63b923b6cd81dff9848246e7d78c2bb47773ae00066b56
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F48 29172 bytes
SHA-256: 3b11b2ac12529a6c42e8d38647f13ab29a8d4e2a4d03dae6f86dfca89a3a26d2

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