Malicious PDF — malware analysis report

Static analysis result for SHA-256 0664ec8853019bd6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 05:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ccc7fa1bbc594d94a98c722887a0699 SHA-1: 57b6971d38879eff0b86565d1496ff8411ffab91 SHA-256: 0664ec8853019bd6a95177cca28d9ff0bcbe1ca543abe2de6fe4694c2b9bbf49
156 Risk Score

Malware Insights

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

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, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or directing traffic to specific content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=briggs+and+stratton+5hp+outboard+repair+manual PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/in3al7k4ji9hnl3plj1v12covu/15608305580.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d6749d41776---48429396158.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/nedosusuvuwimek.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1d9fb77---pudabazukasuvaxoz.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/99541551318.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/radizenaxinup.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/tarudejamimagofajarab.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00404ee99.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/54067019667.pdfIn PDF document text
    • http://myqself.com/upload/files/78653482320.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/zogopolameji.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/11148854585.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/xijuzufawurumojubuj.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/36504704897.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0705240357---magalilixuwebovi.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/65308262587.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c569a1f78---87797651267.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb92a2ec6---56349819865.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210902200853.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4502366063cfe4b4eedb8c892e04137c/sasaxokudexowud.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/71452518507.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ovh62upttmf2akdt8bua0acjd1/88147552455.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vebizewi.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/16u8h8bi9ctbkepv5nclajcdli/natijamonodo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210427215103119.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/pesuwabaxi.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_off0000d2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D5 18988 bytes
SHA-256: 2cff504980b755682e18818b781308cc5afe4fa8f30058826af9d59c000d79f3
font_01_sfnt_off0001035a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 11268 bytes
SHA-256: 346c72a7dd43b600e4df1cdc493631544340a882acd895134b145b51b195ed67

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