Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cf9ea5122b5ef2…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 00:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a8f8f83ad6b75cfce4cd118dcca0f807 SHA-1: f129c08ad32959e8d26656cd48694be9e001c923 SHA-256: 02cf9ea5122b5ef2e74f27de76242f0efc7f81842022fd11d9853d6ea373ab30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites, leveraging a link farm strategy to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=icd+10+code+for+fibrocystic+breast+disease PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bd50f084cabc818b76348dce5159e340/92197560093.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c480135d---getupoxavolozutowugugeg.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sutojinotoxogisizutedaro.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/36903088241.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/12066900435.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad03095b50---93136240295.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/8335158447.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c3ab482b1812b274093013aea726ce58/dulesokufupafopisudepu.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/fifuvamagukugibedes.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f7671f2a99b05b041d66cbc2cfe84ed6/firunivajejaxebibapew.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/74149954158.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/df3c64266bddbdf91b584d8858f6d3c5/folanadutebigipefapifibi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/95897959263.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2609b5a5.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd71b31dd---kezagurutomuzi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357ae3069a---85543266288.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef90c8a37c---sefofi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99390283085.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/bemibuvetudovavunifet.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3a0g6htg3jauk5tnsk95ukolsv/zibaxafejilulowejovosow.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b287e6aaca0---napademolabanux.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/25227793511.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43e4c3d32d946ac5bc14fb8d1936639a/62483256062.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/31e0021cb46f4b6e02f447c1590e5265/sutojimijijuv.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_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 17432 bytes
SHA-256: e3f42b83433a685c80d07c41f005d42c0995d3a42fc9276a184580f3aa71cee7
font_02_sfnt_off000136ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FF 10696 bytes
SHA-256: 475f4bc36fbf529a61704e94bba2830e49ad0c43190a4e51499743253e59f126

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