Malicious PDF — malware analysis report

Static analysis result for SHA-256 8302dca9713d1df8…

MALICIOUS

PDF

71.7 KB Created: 2021-07-13 23:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d113577289562760196524b5e9129b29 SHA-1: c536ad7822764685eb74d459d3307bd00787da04 SHA-256: 8302dca9713d1df88fcc4ac1389cd6fe8f8f5c949d3a553b1b030ef6137a439c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm on disposable hosting. While no scripts were directly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8a6d5c4d---teregiw.pdf In PDF document text
    • http://aranykoronakft.hu/userfiles/file/pigaj.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b3bbc2dcd6fb93a2e39abc20fd6e5248/lepowu.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a940e5cda610acf0cc0ae5d3dff90588/39745208365.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/76440829698.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289caec2d8---viwesajumepibato.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/51102979714.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762856d76d8---53145850824.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3eec862d2dcdc0fa64fc9ac4820a0e05/42205725763.pdfIn PDF document text
    • http://yilip.net/userData/board/file/lumizelupaxawatojo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/01018f2d40500ced875c7cad785814cb/64353598359.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4609276511dca80998feee55552e28fd/16265760647.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/55515590605.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a5hss7hokekk45a7m7hbqoen82/nunafire.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0805810001621246854.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a99e58b5143fa36dcb54e21a4a4c7f90/28867769277.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3affa39aa76da675a553430f61d7f366/48975142294.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/47446206844.pdfIn PDF document text
    • https://soechi.com/userfiles/file/mekoguma.pdfIn PDF document text
    • http://ahchala.com/img/file/vefasirasoxax.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606e968937102---nixebe.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/7996797705.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a2f9ab0c---menumigisavivake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=igcse+stoichiometry+worksheet+with+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD0 15684 bytes
SHA-256: 339da3c022d3594e0f4e0ea6485cad88104d859a93c8e29dbde8a6d21c1609f5
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10876 bytes
SHA-256: b25939ecf90c02b45400417463ba26abf2ee21b5d4e2164a874899a36a8b30cb

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