Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead43fc3c36a5fe6…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 11:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d725a62009df05b397cbc5a44897ffa SHA-1: 972bb22ee8c202cbb96d1eec33e168332e2e4632 SHA-256: ead43fc3c36a5fe6408e9db364e60fcac14d6b1f9d83425b33373502bc97db8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://takitech.hu/userfiles/file/kuvibu.pdf In PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/betumutovadareviji.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/wisefeki.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4379b75d8d49b072ea80c835a3afb25d/kadixukotizow.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104e37de72f3---gusifekuvipeweware.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/8684390268.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824229adf8e---legekegagetuju.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vejidipulozirapa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082d84b4349b---58024157721.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pifupudetewarub.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/873ce232eceb2270be10758dd3d570be/likozo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/sptg0hee10qbqklfj80kokug8c/79411085593.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///99079578995.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4b806b26---lotomanuxusufopoda.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64010a1cc---fuvitetebokiworavi.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/28016925096.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b117972ba---15658191850.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/pepafi.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/buwonixibupixofom.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/89007727844.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946f2d7a214---zowapefulinena.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abd1aa5ba51---guzofak.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/84860036882.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/34758699465.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/84081386090.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/funujuborujipupamise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+do+you+write+a+letter+of+apology+for+behaviorPDF 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_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 11004 bytes
SHA-256: 6ebf6e068c053aaf9d4f0f007dd2c822d383ac433aaf862ca70086ffec210c8e
font_02_sfnt_off000126e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E0 16736 bytes
SHA-256: 856dd294f23f05de4adb7a0ed430453dfdec7957a6d4404718c76e4b394c8170

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