Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ddb7084530304d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 16:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2377712f8b09941e8afa5d555ff8e5e4 SHA-1: cb7851f9dc6a9be59a96b6b9663800eace4234bc SHA-256: 79ddb7084530304d387aea458977a45e577f83ac7ce5c979678df5adbb42231d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm to distribute further malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160707ad7521d9---48622018524.pdf
    • http://blankheich.de/images/uploads/file/nufevo.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f7f3d76c---90049841020.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/76081323730.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1k2v8lhnm6o1h6vih89fh3cl3i/sudokulo.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6d7e9b953e52333449497f4c0bb29b67/zoguse.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0616642---69106784464.pdf
    • http://rosesrealtyhomes.com/userfiles/files/66400041343.pdf
    • https://atlastoursntravels.com/userfiles/file/72710712906.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/givisoxaxexonedix.pdf
    • http://allasclub.com/campannas/file/tigipikulisupefukuwoxumur.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/689f719e75286f383c6ee870cb0e17b2/69808911359.pdf
    • http://tulga.ru/editor/files/xadidajokulewiwowitanalo.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/br8dd9rir1todiba9f8p1l3qv0/gegunibabatuwejutibefava.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ccff62be50e4e85b2d450c8cb2d2ca0/84479064554.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607034c0e0cca---nuzenefujigukituperi.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/moxuboronilakirifox.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ccbb1bbb0---vodon.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e77f0a929152153687e1840244f00828/fogob.pdf
    • http://jkbprivateiti.com/userfiles/file/daxuta.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a1976bfda---topizexiv.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf7e792f---jebazamejeronimebizatuxeg.pdf
    • http://cristal-in.fr/userfiles/file/2180931080.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/65078266236.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+happens+during+carbon+fixation
    • 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_off0000f53f.bin
2a148a52de6651159f60d1013d3eb59dc091b8859bebf3649d71bdb0fe8154d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 11188 bytes
font_01_sfnt_off00010ef8.bin
59675ab36124d0d00501fef9a4a2dc66e1bbb3a5dd4670b78ee96563d4a729a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16632 bytes
font_02_sfnt_off000139d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139D3 16792 bytes