Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d9ecbd1e61417e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-11 13:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6b37579e093be711a17c3bbf4551f9b SHA-1: 66c44aa164291272d95a56937c35419064169e77 SHA-256: e6d9ecbd1e61417ea820cf076916f00f3f2b0a1176ff48b42754bafe998a66f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous external URIs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs and the overall structure suggest the document is designed to lure users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ketchas.ru/uplcv?utm_term=play+game+bubble+shooter PDF link annotation
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d78c3e4cac98fd57ed906b4bb7df5681/vufiwat.pdfIn PDF document text
    • http://immopolignano.lu/images/13036587690.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/82058731893.pdfIn PDF document text
    • https://icbacademy.com/upload/files/76383618235.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613143d08b04c---fupasevanepatijopogofad.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94495f348---nofunu.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/kijejexo.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/77897844968.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/12952701508.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/kemudoduvibujibesetuf.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/93122718599.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/gimaxawojazofulovuto.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/85251408738.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/biwonukuzurunenifaze.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/64012704660.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d9269493---81493584181.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce3234821---12950691700.pdfIn PDF document text
    • http://chenruichem.com/upload/files/levamefapinefemipo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/mb9nnvarn99rngfef5h7demtse/fefamezodetumefomevefa.pdfIn PDF document text
    • https://renetravel.ro/images/files/zevomixijukovuma.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64506562955.pdfIn PDF document text
    • http://telektrans.hu/editor_up/77648583582.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_off0000c2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B5 10716 bytes
SHA-256: 721f36c08a094c6bb66614e97aebdade83dd3cb0ee5999aaa3e6ec647df0015d
font_01_sfnt_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 16620 bytes
SHA-256: 74b7f7165e5506024fafd5404d88b5de785e402521fd59fd3cabcb94baf0e5be
font_02_sfnt_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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