Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e0fdc5ab651dd3…

MALICIOUS

PDF

80.6 KB Created: 2021-08-19 20:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f9cef7caa479a0a5bc496873b806b40 SHA-1: 651c0ce1190fd74512f208617517ff9e9bc748a8 SHA-256: 80e0fdc5ab651dd3bdf97d53fccaf8f1fda68967779811c8143c42d6b40c9b2e
96 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a lure to download further malicious content or redirect users to phishing sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4faf1b7ae---53185144405.pdf In PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5270fa91d15369b3f602e1df296448aa/83163269516.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/33611540209.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d6295008469d4f7ed3e3cd385fc3069b/nukifug.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fbfcc003---60161808630.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf8d01ea1---nofumuwotulelotexe.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/koxokeb.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/xenadori.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e0f48d244---52703481490.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c711575d0611c21f7e02849f5127ddd2/54676871068.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/983abeeff4516d0ee8d0bc090bc8950d/48685848357.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/v91d2j5gv5m2cdv4hrq8r5b3j0/tunojizalebiwiwa.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/godulezakejupup.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/53302138071.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f795da28b7---87736227301.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/famoze.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517c413e97---87413042797.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/nejazitimesi.pdfIn PDF document text
    • http://billsky.ee/files/file/tolonosonuzud.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070815102573499.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/40125167955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=escape+of+the+chamber+of+secrets+movie+summaryPDF 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_off0000d8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 16412 bytes
SHA-256: 8939824896dd1c834a355f5c43d84bca481c74c093dd136dd3d2175bbf541684
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10996 bytes
SHA-256: 51bd0641a9c8fe08eac4d14094ebbe595d0bc648f1823422357f87dd7f023bc4
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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