Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab6bc390ba94144…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 07:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8658d0383a756e853e4f45f659519a5f SHA-1: 347c4abb3a1e33a70ae5ab49ddf2d9ec421bf202 SHA-256: 0ab6bc390ba94144c6f13136fb04d4b8deca798ed545670428416b71fb351eaa
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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 http://gocep.org/data/userfiles/files/tinav.pdf
    • https://mmtours.si/uploads/70257540197.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/55650333997.pdf
    • http://iranjobex.com/cache/fck_files/file/jazemolazujanodapu.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/kufelitogalozenuxid.pdf
    • https://buddhaart.in/userfiles/file/30118336549.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea63e64c2f---rivarebanesirulejiwegazok.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/sufupaguxol.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/61608492890.pdf
    • http://nanumed.ro/uploads/files/nuxavojofozuvoses.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9ca74f07a---vixudiganirovu.pdf
    • http://grandviewgroupresort.com/upload/files/63745685091.pdf
    • https://nepalonetours.com/userfiles/files/32518775399.pdf
    • http://guerrazzi.info/userfiles/files/25951128724.pdf
    • http://esoftland.com/userfiles/file/tajuv.pdf
    • http://tianlanlawyer.com/filespath/files/20210904140331.pdf
    • http://hocomesun.com/upload/tovifulofalotikomefa.pdf
    • http://foodzipo.com/uploads/userfiles/files/14909475265.pdf
    • https://suma.ca/upload/editor/file/xipadoweburetux.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/5560882880.pdf
    • http://ppfi-online.com/userfiles/file/13588140767.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/16797628655.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/65742019883.pdf
    • https://komunalno-vrgorac.hr/files/jevogideteroz.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04d11dc8ceb156dbf2d33bd1afef55d2/94183362201.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=which+two+colours+mix+to+make+purple
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 16792 bytes
font_01_sfnt_off0000faeb.bin
477fc8c179a23a39e2aa9feba4a428c72387b8a9f4516c90440d487dcb166442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 18252 bytes

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