Malicious PDF — malware analysis report

Static analysis result for SHA-256 7673df78e1bb618d…

MALICIOUS

PDF

84.9 KB Created: 2021-06-28 03:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9ec75d739d9ff1de17b39e8296089148 SHA-1: 6a1b88c6d42b6ed0ff71504b78431e379c4989a3 SHA-256: 7673df78e1bb618d677e8e8745d15c995b10bcbfcd4a6f00e8edda17fd197c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF structure itself is not directly executing code but serves as a lure to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inwebjor.ru/uplcv?utm_term=year+7+science+revision+worksheets+pdf PDF link annotation
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2079d8d01524fe78c33da8b6f839d8f7/tolikipagobigupinosu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/f60bnrehg4r3fm9vdnqmbtj8sk/lafexumuroriporasin.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/23c7df229444a43701c7128bce38fd80/52625542012.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jno51vit7nmfg681oscfm4ncvb/32313141226.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87aca38b9e---gonudinemobojef.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab08dfa3723---sulovikonafuj.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd411f6a8---33356410236.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/67d87a43acb41e9fd66045de59cef297/82471497716.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/do15r50q1samlsa3gtq0elbh91/87454428150.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/72238000352.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c8a4c0d0---4784907504.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/591ecebb90a684954750200d752ed0d9/kijelilolez.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d2fd793fb---77079169058.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160766c4c728ab---goganadiwube.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/nexesubuvarutabodew.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/57360838467.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7ffc23fb8---gawidilegodotumeluro.pdfIn PDF document text
    • http://www.centralperdana.com/file/64589620458.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/ginibuje.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/katewujapilogadubawopifud.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/khg0rihjsntdab2i3anktc5aac/sasugejutababetegerureba.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b829c1b81---zalizufofulapad.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a21d12ec48740cae56b3786073729037/32141865055.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/e9fc8ca775df32d62aaa086aaa565b5c/84634265600.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4148e473---87961178101.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/f3d47kgt771uoe590l75u40fu6/79404626928.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 17276 bytes
SHA-256: 968f4e1d53c5cdd0fc38141c2bf1836081e254c8779d502f9cc455d70def5236
font_01_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 10948 bytes
SHA-256: 3b0b2672761c0ca94049577d7fc0220f93d1996e2166d34b0a93649cd89d1b9b
font_02_sfnt_off00012dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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