Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b442c3b6030b60…

MALICIOUS

PDF

98.0 KB Created: 2021-06-30 21:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c5689aa6a1b7182f42bf85b95193ee7d SHA-1: 086378c99fc8fd5cc8549124acaa236fbe43b290 SHA-256: b9b442c3b6030b6010e1c6c3cd4130164200e434a124f4d2c644fc889e342a48
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 5

  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e463529009---30370049198.pdf In PDF document text
    • http://maility.pl/_ADRESuserfiles/file/95816620324.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/zurapogajelud.pdfIn PDF document text
    • http://jfe.hk/userfiles/56794513331.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hp2g2ho8sem9edetl2m7f9q429/6974535738.pdfIn PDF document text
    • https://tantecoccole016.it/file/pabeligig.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e986a9e5bb---lofokitijazudito.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a024bb30035---41740294009.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/nedixi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/99v8uimak865rregp381c5cur5/45321072668.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc11164ce98---59312905194.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8a796f9f70affb2c142073e55681ecd7/59484307133.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bdc420cdf7d489d5332a2ecc96f723d3/28407974149.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/dfb4ff75er1ed67vgh4mvcjik0/balikijejaforikavomil.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2cd49ad5---fojewunumele.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/ptt8luds2nuhimh7uuafes8hjb/91061373280.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/todozasizasixetasunepi.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/xonepotepurarafusuwu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/voxilubusubujasawixaj.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d12cce958dc2fece40cc589400e5bf2e/22172289462.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/94538386306.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gnp1a9utq04teil35svcl8pl36/36049272629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+meaning+of+categoryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e97b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE97B 26124 bytes
SHA-256: 5ec87efc2e5f7c58d71854caec62d2237f5e69b3e4cd14412bcc49e2fb7f8140
font_01_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 10648 bytes
SHA-256: 7e9154dfa1edb530e76e22457d70c7e48e112663292bbef8437d32c70e584079
font_03_sfnt_off0001496e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496E 18836 bytes
SHA-256: f567266c560c32ba456c243b590439461018be9fcbe1d9cbb525c9785c11f396

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