Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7c72a75ec20281…

MALICIOUS

PDF

84.6 KB Created: 2021-06-17 08:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ab17f79eb054ea137cba1dd801e48dc SHA-1: 521b6f76f7d84af0dc46d3b09eb2948796df4dad SHA-256: df7c72a75ec202814620d80058618549584bc113281d0cc6f8e12ea8c005ccd1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing a trojan. The embedded URLs, such as 'https://philabc.ru/uplcv?utm_term=revit+2020+family+templates+download', are used to lure victims under the guise of providing software templates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8113

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=revit+2020+family+templates+download
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b77007c4---65537881355.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160acea385abd1---wumazopuzesuv.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bce2ff8c---92281606826.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nig37b4s3gmp42nf9fr4jgeq97/jegux.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aec51e70b---sarapivoluluxab.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4139281cfd---73038686360.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/859dce94c836a66b72284fd652ef3104/3778299465.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b38d63bd---49809346154.pdf
    • http://acecaalcoy.com/userfiles/file/mimukex.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9793cadd1---mulasamevajevafusuz.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e71941af---bitesorinenodafadir.pdf
    • https://bandotrading.it/uploads/file/86731238742.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607443e3bab44---28559646554.pdf
    • http://birnagarcollege.in/userfiles/file/gozemidasidunonag.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fa7c.bin
6bdbe770afacd43dc61dd948a4ccba97d9d68515e47944d97dff08017c0910d0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA7C 13064 bytes
font_00_sfnt_off0000e744.bin
b2b4b82972cb7582b906344031d00fe0856deca02e0a218d8d3f881a2806efb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 5628 bytes
font_02_sfnt_off00011f35.bin
ee28b848e8b90ed90d257a75dbba0e14bba27dae21e1aa73e52c27771ef6c891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 2492 bytes
font_03_sfnt_off00012a7a.bin
0b4f2d8021bd2c4089869924cb1c0762fca95b062afacb9f112f5ea0698c069c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 11596 bytes

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