Malicious PDF — malware analysis report

Static analysis result for SHA-256 815d55cd264feec3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 12:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6f10727f348068b70e0abafec9d7a1e SHA-1: 7def35bf55eaec999bcca646ebac9cbe364617f4 SHA-256: 815d55cd264feec3ac92e5eac433106146a29ee6a1ea052ab9c016ca71faf92f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/db3dc557771948d0ec20bf3fedc89af3/banivobujigowowos.pdf In PDF document text
    • http://www.frank-diagn.hu/userfiles/files/zeluravifotelanik.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/jamililurupinanolefi.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/161445b624a786---xegibuwabevexakixujupedul.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5b97caf---petosazepepakones.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/luvuputemox.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rexew.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/vigelojidenasuxo.pdfIn PDF document text
    • http://labradory.pl/file/tomakapugod.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/zetizoluzubifebita.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/luzuj.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/16514452076.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/supikab.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/81685778364.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/91857997452.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/97470273784.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/vososozasarekijatuwogexev.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/geliluxeket.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/30922172831.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/savegofiwimolejugu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/85697553990.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/94118805053.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d106f06473b2bc344036b724acc6ac88/27619943420.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/22994946133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=administracion+en+una+pagina+pdfPDF 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 11000 bytes
SHA-256: dc28c3ab65c52734efe672935329407383306f1873b7926313fb2d57e2f993a2
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17616 bytes
SHA-256: 1dcd0c0df446b7fe274d2ce93b7e2c1ab2143d49ad038b590531517ae25a8123

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