Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecb70c7c6a91114…

MALICIOUS

PDF

100.0 KB Created: 2021-09-05 23:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a56fea471f59e88b04a7ef986cb3497 SHA-1: 28b827c99893c5370980bad9d4a4c62729f79951 SHA-256: 2ecb70c7c6a91114355d415309dcebc055da70629dcf6a8be178e94400e5efdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such sites for SEO manipulation or to obscure the final destination.

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://asiquim.com/ckfinder/userfiles/files/31165173426.pdf In PDF document text
    • http://efrex.cz/files/file/juketirefedufidinebada.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610b0f29231a6---74622073418.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1dc86875b62c9a98cb368a1dfda6e1a9/larawujisusonawuvukasax.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/petisetu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ae7d7190---libapigomu.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/32791866997.pdfIn PDF document text
    • http://dztechfin.com/upload/file///supur.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/0a085fa0e3318ca520c035d911cc332d/bawewevodilelani.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/30nofclsj7c63dc63tukgan9hr/fuxuxoteva.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/jawuzitudufafodudov.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/37190162596.pdfIn PDF document text
    • https://lecachet.fr/docs/files/peguvukosefinif.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/4737476049.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b737942552c---81788601305.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/rogorirakizivusexurero.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/52385133842.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/71479356531.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b817b554ff0091b007be03d670083894/77623360360.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/nuworomab.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/0ba893560d77cf5fba0783e5fc5c548c/komilad.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/26f713af0d55f7e9b2e660352097508f/tejukimililazofixuzedidom.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/83439994793.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/simira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=save+jasper+report+generated+pdf+to+file+in+serverPDF 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_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 19276 bytes
SHA-256: faff2a7dbacc0c44fc728921b733e817983b36274466d4a987a55782b80235ea
font_01_sfnt_off00015074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001688b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1688B 10944 bytes
SHA-256: 441394126f22c4c6bfabd83eb6620b7ba8ef972ba6b6b60ad00c8d073fc89f98

Open this report in the interactive analyzer, or submit your own file for analysis.