Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cf0f85d03d41c3…

MALICIOUS

PDF

69.5 KB Created: 2021-06-21 01:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36b7f9d976e224bce6dc1e92177efbe8 SHA-1: d23ccc3201f907714b4133477b3cfa8da3bff404 SHA-256: e9cf0f85d03d41c3c643ffd6f23bd030961ebcdcfc2781844addde67dd9fc25c
94 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of multiple compromised links and a redirector URL indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://pistant.ru/uplcv?utm_term=dilwale+dulhania+le+jayenge+torrent+download
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6qe4lqltphcro098a9v3c4i2d7/52501052980.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941ff789334---17629622961.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ca8252c4---vuwotofulunagufulidu.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/tamejakogiropiv.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85f7f6eb47---12511865425.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d6ad54610---93203273953.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtm14ase31c9lv4ihd7536o6vv/88910580060.pdf
    • http://cuacuondaiphuc.com/upload/files/21050397033.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/hhh7tc5d1hbjeb7oeaep4o2rd1/xajajasese.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3daa446fc---58548544839.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/38134793389.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bfk7q7b90s9hrmaak0h0qmttm4/najiwedufisorupomifafaji.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4307a324db---32273999649.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s16100h3343qprl1rfqjmkq7tk/sekekibup.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba774ab94---pagixojonifagulubemabi.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e958e648ad6c0e8663a68a47e3145d1b/kuwesapaxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001039d.bin
86669e63ce1f78a62e109fe2b3c6e5f5268761a99156726b8a723f9184c3c082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 5176 bytes

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