Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4b5308e24a191e…

MALICIOUS

PDF

84.6 KB Created: 2021-07-09 04:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a9d4d26fd2bfdd9143625b2c7b62101 SHA-1: d0a8c79c4abae0d2c3b99d6bf1c8e8f319aac47b SHA-256: 6d4b5308e24a191ec9e6d68aacb94e7608a7d4e336f7ec79b761557b15de8241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=free+spin+for+coin+master+hack PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8080db6b2---nurewasozebuj.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db3d03bb896---78008996541.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724322454d0---62491426750.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cd69e70b---kopodejikubukalus.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/kadizet.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a1c8a95a---42674405599.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/pegiwotelukonol.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jnc10h0n39u7ikhqef588k4qlr/73114932216.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wifuvixemosesogobuz.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dafuxuxaxojugamezoga.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/40334448963.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/13509121342.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3017128b---tulijomozivabuveguk.pdfIn PDF document text
    • https://amblamy.ee/upload/file/bejujukojogabifonapural.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/8b46fb901a5b25404df5fceb3a0e05a2/42278202874.pdfIn PDF document text
    • http://ahchala.com/img/file/mevorazitotazolelevope.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5b6d29b86eb6976e0cb513e705bf9b55/nizapuwoxuxukon.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/53178243534.pdfIn PDF document text
    • https://roc.mn/uploads/files/joluselonilorevulexejo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/967aec1debcc1efdd4db4e023f40a3cf/44830165799.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/kutavasaretimobofulepaja.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c12e3e89351cacb5abce63f6237a7d7a/89531224465.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/80889833991.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210709091712.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4a4a04b84ae2283c686fb8c2d3ce7c2d/jowade.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/julakizulodoje.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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10768 bytes
SHA-256: 6ad3a7017b97dcf2e94f1246381e3e7e0be3b3d4adaf8e911e075f042598382e
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 16980 bytes
SHA-256: 8e197b4feb1c241f280b0c2eabf8034ffd159dad0e23b13844ba9b179b9ad3ee
font_02_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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