Malicious PDF — malware analysis report

Static analysis result for SHA-256 446ae50b6910f52e…

MALICIOUS

PDF

102.7 KB Created: 2021-09-07 22:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f52adb0f38265769e5283fcce23f135 SHA-1: 4222e7e963a97c7390af621dce64048e10b78faf SHA-256: 446ae50b6910f52e5770c8e171a95849b26e23fb9a2c80e7a89d87dd5a099a5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://medvor.ru/uplcv?utm_term=endarterectomia+carotidea+tecnica+quirurgica+pdf PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4aa2cc853e54970b805365f29038cf9c/nolafajedinizukulir.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/8002119180.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/50095186659.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/pidezabemazejevefimove.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/99294005873.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/11326692362.pdfIn PDF document text
    • http://poiskvod.ru/images/file/nexudururanoxonar.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/60897326298.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/jirovegesukebe.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/46033939292.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/96835885646.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/11478824399.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02e0225a5---vorozi.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/96089097869.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f7112622b4bd936167177723a8235883/83913699770.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc91febdd0---16180731424.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/lurovomonaguxidarikej.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/88619473681.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/7607787936.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ad62890779a95480a51485b59587dc46/5153489536.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/rofudixosulaxenadosuxe.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/26171979094.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c207ecfb4---fulixameb.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06a892627---22147908197.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2050dad11bb516ef70cbde713f0ff9e4/wirewidubivirixusibe.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_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 19636 bytes
SHA-256: 4736e4cc14b510399ef10523243eed644ac08917b6d212b1c8abcdc7ada11795
font_01_sfnt_off00015b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AD 10980 bytes
SHA-256: b72c91126e016a69b0456d1bbcaa66d200a696257d688169afd3c3f5ae9f923c