Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a1932dd00c79d9…

MALICIOUS

PDF

91.5 KB Created: 2021-07-07 23:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97bf75a85527222c27d94bfda9e84d8b SHA-1: d00d983e5b81eed32660d32a99fca428d4ef276c SHA-256: 15a1932dd00c79d9063453c197179cd54a8f3fd519e6198dd4babe67c93df767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f69c230cd---19384636561.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/64477905d622a2b86c851030540fc0d6/25429380686.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d32e7111f533e2687d275df19304c31e/veluwawonalisejoxeziwomak.pdf
    • http://studiotecnicodavico.eu/userfiles/files/4776913053.pdf
    • http://akicgiyim.com/userfiles/file/wotuxidurafuviroxo.pdf
    • http://islandpointfl.com/userimages/nobumapawikata.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/85081899371.pdf
    • http://hopkinshigh1988.com/clients/75739/File/numigosotufimo.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/cce0531d30b84a8bbf5af4a24902f39f/zusebelosav.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/755e856b0ffea39aa58b3dc32e6dace9/32265402247.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081093d98fef---11855308066.pdf
    • http://webursitet.org/Files/file/dimupapeva.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/807f842f968c240f8998752d3d0ffcd5/48562137356.pdf
    • http://elma1.ru/!upload/files/jiwux.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/vazipixaxefesulijixenu.pdf
    • http://hgbs.de/userfiles/file/81330663697.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/davoten.pdf
    • http://atthaya.com/file_media/file_image/file/vidazasuwivepexunuvobo.pdf
    • http://funperm.ru/content/file/kuzolagapebapetazilaz.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07b69c65b30af0cc391739172434e0aa/rokewurarenemexoroferife.pdf
    • http://absolutelyneon.com/userfiles/file/zevazekuzudivowi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+postman+always+rings+twice+1946+cast
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
font_01_sfnt_off00011873.bin
0d3a432d99742358b3ed598a03f9bcb21d1c5bddd907fef1b90f9dbb9e311a9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 16828 bytes
font_02_sfnt_off0001440b.bin
81b88b8bfc141ccf9b502698b86184487fe7a0cb71394833043d223d0a303c11
pdf-font-stream PDF embedded font (sfnt) at offset 0x1440B 11448 bytes