Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09984df690091d6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 03:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 08c434cb2924a5bb9f4b7ca249e365b3 SHA-1: 2ce36eaf8b5a5ad80b8cbffd72c40f913ffe9e79 SHA-256: a09984df690091d6f58dbb1f692210a617559817448efc9d993b59943eacf7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18873381805.pdf In PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vivebuwamuxavegevar.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/70084430597.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/88927025133.pdfIn PDF document text
    • http://geose.ru/userfiles/file/4697526183.pdfIn PDF document text
    • http://milliondollardesiclub.com/upload_files/featured/files/pugivusowetafabijom.pdfIn PDF document text
    • https://31app.com/userfiles/file/50829648107.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/17623570773.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/63592614704.pdfIn PDF document text
    • http://polkovnik.su/upload/file/54141759278.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161364302380be---46926112535.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/88426443714.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/pibebebop.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/80293551879.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/xesajejijo.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/20654071304.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/63735065352.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/27722852316.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92bbd5256---pugurebugumuvirer.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/3457402738.pdfIn PDF document text
    • https://coil.hk/upload/files/90998085631.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7095a833a---62976517154.pdfIn PDF document text
    • http://mfcpavpos.ru/file/77496067299.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/52e1510877a59fe174547cc79bb4481f/99774521447.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613983ce61433---gikitepadijolidume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=hunter+assassin+mod+apk+unlimited+moneyPDF 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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 10852 bytes
SHA-256: f720867464cc486898dc43a1b50ce7631e8328b5951d4ce90b68a98f7171065c
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 16844 bytes
SHA-256: cfd1d7b19fbf376a7f3244938bb56785a3142378961d9ea22fd22ed255bdcfb0

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