Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b85b5a3fd14154…

MALICIOUS

PDF

125.6 KB Created: 2021-09-06 22:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c112e96a91f6c7cc68abadbd894fbab SHA-1: f46c4ad984fb02cbd9cfb88e2b57dec7a234eda8 SHA-256: 28b85b5a3fd14154aa4174bc36351ac33b63354138dd9e8a3ab418504778536d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed for redirection. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the structure and URL patterns suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.museopizarra.com/ckfinder/userfiles/files/temadu.pdf In PDF document text
    • https://iveducentar.com/uploads/assets/file/66873400892.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/towep.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/46725779183.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/vizotesiletevivejuvuv.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd8e34e33---jipoxiganovubuzuxosaja.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__610ADE4D31D47.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/3792526644.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fqfcfe5bvfa3us53jlagj5tqdn/pofujanozajimikanobutezi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c32d1bdfe---5685225103.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/4uqa6aopajtkj705f73h2qq7o9/85315053668.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a2b32f67---47564486721.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/19225616499.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d3d2170d5---vimavepilefunebesazizamux.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac08a9d3db7---kawetidelefebafedanig.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4fcb64b49487326df47e8e67c62817a4/23543331436.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/81159426763.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/tijawujibukanoke.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/zavobalug.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/fumuku.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160963cfb69d01---98496988988.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xetafufesikajurej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=compilers+principles+techniques+and+tools+alfred+v+aho+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_off000181d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000199e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199E8 19964 bytes
SHA-256: 64d03f6fad6f2e012758d34d63f69783bc8361ed028c04277d589d3297dedac1
font_02_sfnt_off0001ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE81 11228 bytes
SHA-256: 978622495db3755847fa428ca1baca739f3f0f7a126bcb8b3303a1bb278fa98b

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