Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d7e0d2fb7a14c1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 06:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49f1b12a19d71b5db3cbfae0bc12202a SHA-1: 47dfd495b1e2eae6746481f409bc085b1005d073 SHA-256: 56d7e0d2fb7a14c18c4b378091d473bbec20e8c97c954ff3e4d8f8f5a6f2c7ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=frenzy+fish+online PDF link annotation
    • https://aquafilling.com/userfiles/file/91269783125.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f69ebe9271a7639c666434837345530a/wezovumidisigawalusirefu.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109212354088178.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/17641549011.pdfIn PDF document text
    • http://electric-kernbichler.at/99915512935.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210922223334975.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/zopakig.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nukexarimi.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vexetejabawujove.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/9515417122.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/64397264350.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/mutabetuvulovolis.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/93147aa7b5a7573ce88c52fd213277ee/lujux.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/87402793406.pdfIn PDF document text
    • http://vce34.ru/attachments/file/lurapasedaporojuxel.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/3231686708.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/61909111353.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161371e5539921---zazoposipivokatowepig.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sumuti.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/34501801795.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/rogavazeximuni.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/30484981185.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff2ad9a85---zifirabitakitofu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/86943027987.pdfIn PDF document text
    • http://ctm.it/userfiles/file/32007807499.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142111cd9955---lapipupigupivufutaxeli.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_off0000b6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E3 10204 bytes
SHA-256: 0192aaebf2604102711b1bcf524538f0149352d0dbde7bfbee723a02ffff4236
font_01_sfnt_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 16508 bytes
SHA-256: 5e5214baa1af250cf09c785d963be4084b26665c341fdc951d050808cc311305

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