Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54522f719175150…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 04:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84934d2407b44083c3ef93cf82f6d146 SHA-1: 11f3d57934230bfb981306b30cb71ca1d1ea4907 SHA-256: f54522f7191751502f10d1331c3576515bb96f940ec772a511979433de5a5f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, some hosted on compromised WordPress uploads. The embedded URLs, such as 'https://wastran.ru/uplcv?utm_term=alex+strangelove+full+movie+online+free', suggest a lure for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://wastran.ru/uplcv?utm_term=alex+strangelove+full+movie+online+free PDF link annotation
    • http://sanyosushiglendora.com/uploads/files/70953542444.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/61429001920.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/lojuja.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614492460a79b---gojogilejefokuniboravepo.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/mogelobu.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vuvewokapelunajeline.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/pevawa.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/pupukepo.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/86012834993.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/rezizusasi.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/63127609119.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/64740542832.pdfIn PDF document text
    • http://blueyee.com/upload/file/282009315285.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/b9729e201bc9d778142d71761e4c487e/94420279153.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/795627100.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/86d7c325254136327d704611c1a75d75/sujawaraniwikilobojonen.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/16248971986.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/69716472776.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/32560770473.pdfIn PDF document text
    • http://machulski.com/public/file/ratefep.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/91682084268.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb8ae2a05---89371333048.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/55955555939.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0c1da19c---72260032620.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/zuxukubotosewegizele.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/zulobavozafo.pdfIn PDF document text
    • https://jung-yeunjang.ch/userfiles/file/21960011928.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_off0000b701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF13 17448 bytes
SHA-256: 4345e857e15f85def6030322232db035eccb4031496be1388e5f2f78e994ba31
font_02_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 10808 bytes
SHA-256: ca2d09aca504276282dcef5b3a668615952f35850c0ea4af97bb3fb1c3c07b57