Malicious PDF — malware analysis report

Static analysis result for SHA-256 4293331a9c60640f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 00:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 35ace0c49f0028364fe7ed598ca5ae4d SHA-1: 064cdab033b7d376d466b3681fb892e8a21d7a27 SHA-256: 4293331a9c60640fcf37ee225d0708df5d7e46f090fba142aeaddba84a3d1d70
64 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other suspicious domains. The heuristic firings indicate this is a link farm designed to host other PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

Heuristics 4

  • 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
  • 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://ketchas.ru/uplcv?utm_term=nfc+tool+pro PDF link annotation
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f58351f85f---zopunajurexofa.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/korufebodigesofok.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/4505949164.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/luxilofu.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/72463227476.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8668c0dfc3fa12c8d757cc2afb44515a/97456451001.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/viwifinoberupiwuriwexunig.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/49845646460.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/02efa609bbdbf014c503bceada2db6eb/kivuxokuxuditepono.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/94094179965.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_9E3C7D77BC1D3C2B.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/51316919993.pdfIn PDF document text
    • http://mobiliteit.nu/files/7014673602.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/vufiwusig.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/tebuz.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tumudofabukozila.pdfIn PDF document text
    • http://cocoal.com/uploads/file/40765874520.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/rujiribesawiwezalas.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/61563558481.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/92899665875.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58127696285.pdfIn PDF document text
    • http://dsagco.com/Upload/file/16947707906.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/vinokipekovulifakowalipi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/70665525504.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/22131013090.pdfIn 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_off0000b9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 9792 bytes
SHA-256: 7d7cad181e593956c11a816be95f31cc1f31a87238c909044a05c9c11b1c5d94
font_02_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 19012 bytes
SHA-256: 745591f495642704d750ca15303a53ff36aedf1ccc44e56e27eab7f0617f8264

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