Malicious PDF — malware analysis report

Static analysis result for SHA-256 88912add60c60086…

MALICIOUS

PDF

86.7 KB Created: 2021-07-21 03:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2841ffa63c56de2e971ab201cf61027 SHA-1: c5582eedcd072af9663a6a4850d81e2d7260d38b SHA-256: 88912add60c60086c7c97c58092ff2a0841f75a1e5346c1f9364fa3dc9cde44e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6a9e605a---fifivojibotujetizutuvuv.pdf In PDF document text
    • http://omatsuri.kr/data/userfiles/files/69699070661.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/jovidokidatepugezoja.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4a63f1835f1e8ce78e5caea9ed1e187e/23520512289.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0j8b9huotjien304sg0sdmkq76/xexijefevoku.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/97276245527.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8affe24ba---94784578718.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/kazirawopuzuko.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fcb38ef4---sunoromesiwufijafuxi.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/65954320431.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/srlo9d7cc9thcmsevj8ba5hrlk/32519425998.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7f138923e8cc472b83a774f119ea7c5d/46290880932.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094dfcf3ef59---1224556334.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/807b97f32776a7255d78425f258345aa/faforizefabafutoweza.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/75136088466.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a42159e1544e50eb79c26b855638937d/gudobepopijubemapazisok.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e033f9a8f8---51276452432.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/pipatuzanobuvizoxumetuluf.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/34109417565.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44d95b4729---97025028176.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb151e19e---79336994374.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3de81876---48336939946.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/88163126198.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c77f56f53---boterosilutefesiw.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/povoku.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecde9c58a4---62730765470.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/nrh5ocvoicg7t8v7j1pvg9fsu8/pasusobezam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=genuine+and+original+meaningPDF 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_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 17624 bytes
SHA-256: 7b255919df9019aa5dfe1edbb7d04a772c77c9be9b8a1532db7a3378c1bd76a4
font_01_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10464 bytes
SHA-256: f00dcdb4edadd11a4f01f5855f0f5e102b191d041a707b3f845489e2ca58871a
font_02_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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