Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc354b48785a5eea…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 10:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d977dc1507cd2247cc847f18e78de6d3 SHA-1: 8ee41650fd0230e03325d72196f40c9e2ccd38d4 SHA-256: cc354b48785a5eeada7ad312f2f7cd7128461b32211394923c280ac1221712c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df00d327d3b358255aeb6cca48f14e9b/vebiwulagufaxopejot.pdf In PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/gisivavexovojapefupuwox.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/98129922836.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/lenafebonap.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a4300f28cda6ebb642f513dc0d604e56/63828491274.pdfIn PDF document text
    • http://apothepharma.com/upload/files/68977675426.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/mogexavevugibonimek.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2295af85f---vakegowupa.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/35101693568.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/88309133940.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c07ce0840---puxigozakunorafora.pdfIn PDF document text
    • https://niceppl.com/images/file/mibafisisuzufiju.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/10897528626.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/96787469865.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/24098322374.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210903_94B64F237EC3D050.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613268c639c35---47439355241.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/95455467588.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/15212622271.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/14926023483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+american+society+of+phlebotomy+techniciansPDF 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_off0000ae26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE26 17060 bytes
SHA-256: e3cdf13111880ad0d0484a6356674e67dfe15007612ff53610586b87a9b616e3
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 10960 bytes
SHA-256: 404b6c095d0f9e520004b2b0315a166e1f8e1ad5016d5503b2d144a8c783ec14

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