Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97747bc3b6afd61…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 09:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad67f576d7a39ecf4a845e4e8b052b42 SHA-1: f6e6a9e24f4680ab38c3a7f987c7f4f79c9ee919 SHA-256: e97747bc3b6afd61fb44f960d018e9853d4cf74d8fad8f7a6af32bd7327b44f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The presence of these links suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure and URL distribution are indicative of a link farm attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://laborke.ru/uplcv?utm_term=requests+user+agent PDF link annotation
    • http://sarljarry.fr/userfiles/file/fadusuzagafepeweza.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/47631499018.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4915c4e02339e343c96598e3d187694c/zorugabiruvakis.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/39841876945.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91d6b09e5---83563280236.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a47afa3ed329ed42d9e0a4952a35a612/bixededuzisoxu.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/76213552456.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/be77b60dd5a858fc1900db1416630086/99276513600.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081767ed7237---90804198377.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/woxibewuwekuriguzafos.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/nivegikizowoda.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/94127335698.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/tamorazonofenodedunezome.pdfIn PDF document text
    • http://wwstationery.com/files/file/17884846681.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/avqac2od0ie2l62auf7r7q8j7t/ponivekok.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-28/20210528010412140097.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/tkhmlvd0mopv1houim9jkfnfop/96983856527.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a0bf320e6ff9ebc63832d1c198a6223a/kelaxuguratogi.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/tewivewodinoje.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0v3r0nptln9crs8o9nk3tu27jj/sopatad.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610136583f38b---tatiwipazavijagekosi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f325b1172b2---44451616919.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ccv8sfh8lij0ommkt5jqkirdji/6197727525.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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 18400 bytes
SHA-256: 69450e484b74c6812b6c231cb7a0638f6a27c8dacda292ccccbcab18821fbea2
font_01_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 10316 bytes
SHA-256: 355e1084905ec189a79664d7e38df3fc4862a9a4eab75236923d4b30425538d8

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