Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4490554f4a9eaa9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 00:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c544b2cb181918bc3ba740a42be5b004 SHA-1: 5cf72c62d750beb73e0d5d4b5e5e8e3ed48e0373 SHA-256: a4490554f4a9eaa941bd92848e13eb0b97a88f149779b7eb9097df36745f89d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=watch+a+christmas+story+live+online+free PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/14f5558d3e13cc54f0fa159ea619adb0/84262192476.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/xikokemixuvun.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090819483312.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/moruzi.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/16894169184.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/53646978204.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/mogurelude.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/gamuwunotiga.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/rajiri.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131211531031---lujeki.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107f0a30c3---sutisubagujufujuzufesiva.pdfIn PDF document text
    • http://tayles.com/uploaded/xudizuripefanesariravisa.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136648bc892a---2302670538.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/72341775930.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/46607402413.pdfIn PDF document text
    • http://hodori247.com/uploads/files/goxirefakeses.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/04083f2440465454367c14c110c56abd/93641049094.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pinogumakepototefuful.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ac8109dec913d17b5fc2e4212b8631ad/26916918299.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pawipevowasewiwinar.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/renuxebuwokewineroxelesa.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/pidabagigef.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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10776 bytes
SHA-256: 7a89e27a1e29b3f8cfd08a52419c09f142dcf76a0e1930cff2e15ad52d1812e0
font_01_sfnt_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 18108 bytes
SHA-256: 05e2000fb3afff213c124b5c427b4804f91a7039b63625d6a8ef4c4f32ea9cbe
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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