Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ef5cc013794b0d…

MALICIOUS

PDF

101.5 KB Created: 2021-09-06 07:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: add90a1fb8e5349562f74471f200d64a SHA-1: 4140bbedeae27b27baa1c79de2b60428f7adee20 SHA-256: 29ef5cc013794b0d487060123ecec100815b7246b8e5ee72c96cbd0fcab9aa2a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, directing users to various URLs hosted on compromised websites. The ML classifier strongly indicated maliciousness, and several heuristics point to the use of compromised CMS upload storage for hosting these links. While no scripts were directly extracted, the nature of the link farm suggests an intent to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611426fb92896---42297586867.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113de64b87cc---bufafowubizepikuju.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/77159027103.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/17022829792.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/38798543092.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/67291569015.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kajuferuferin.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/84411538422.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/431207be3a81f7665844057c3a564401/vewuxinutuwineleso.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/61642268696.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/bufojenuvivanivaz.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zonovezofiwofilekit.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/b601fca88678c218e4b828254844403f/64917379758.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/seduliluxorujozeropit.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4512b9a4c9---21522417559.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/nretguau06rjh4jfclu197mumi/8187386792.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/89878084952.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/norogudopek.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/sukiporagulodil.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b319c72bb15---molodexelonikiba.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/1343359865.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/33810725595.pdfIn PDF document text
    • https://cargobull.cz/res/file/61735879329.pdfIn PDF document text
    • http://ashioke.com/images/library/File/waneguzuwavoxu.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/62699577062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jazz+solo+guitar+tab+pdfPDF 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_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF1 18572 bytes
SHA-256: 57f9cc6d61d87ae81a92fa12732499341b4497da68aab9cc2b88efa18eca8c5a
font_02_sfnt_off00016fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC2 10728 bytes
SHA-256: 706db20524f9d6314fa7c7eb78d204c7e66fd440a40e3191d1cc8396db2c685c

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