Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4597d341ca4f411…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 17:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5a49be0b796e98d9623525eb38c05af SHA-1: e08350b0427b30ed3cca4cf50101f5ae2f546fe9 SHA-256: c4597d341ca4f41165827525184ca1731554442fe2cb4b97ad3b42d7c4a36e1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=action+verbs+present+continuous+worksheets PDF link annotation
    • https://tecnicadovolante.com/images/file/93784768112.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/sefar.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/tinifazejovavexuxajinu.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/77702086253.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a500f9c2---83270308288.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/nageved.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a6ab9289---58908963058.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/4864439673.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/88243512678.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/69432104492.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47367808535.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/polinewoviwulamukod.pdfIn PDF document text
    • http://fxmeat.com/upload/file/b3d75374b000626cba5032e4c3365866.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1c751781---99846647302.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/54777250298.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/dijenulox.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808f28f10a2---87841183611.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/72569196855.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/48473777982.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/64065838134.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/71bfe6d10181eb38fbfef443c8534b78/41736209300.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/pufewopuwakexumu.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_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 18212 bytes
SHA-256: ad52578587b6b6a155b730ec0f8aa80459b7c9a3454cb765042687e32027af9f
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 10728 bytes
SHA-256: ef7d3609e748b4bf953966cc82b79dcd8de0f211130fe48ce0cbd39dc1185473

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