Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3decceb1ffdf6a…

MALICIOUS

PDF

79.1 KB Created: 2021-07-18 06:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5c59a3f906695ef37664c66f108562f SHA-1: 841aaa674478d0a59531311516c556c7fc73554c SHA-256: df3decceb1ffdf6a943563f24d51fabd158dd53723cb540b91e53b88faf10d0f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting malicious content on potentially compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7547

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/oi2gufe0a1loeovihjdcdpv2ho/wojajamofuwekujoxux.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb9a84a1d---6842416395.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abef9523ddb---482777321.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c3ff2a530---3874765942.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/4800803296.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/pijazidaxuni.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kuzimisivalikuzuj.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/eb6a6b9835b4ec43970bbea9efedd0c5/61590322318.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/xelisikonevowe.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae95977102a---58598827662.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1d274ec6688559d9d9075748cd4b8ed7/32518585226.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/64986638502.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607920351795e---fadukiwuxudafaketova.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210603140329.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/7stsgc7eu3vgdej9q0trmiru7l/78353508034.pdfIn PDF document text
    • https://noddy.nu/images/file/66506156135.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757d0377e5d---lupasenotexed.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/47312512584.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/wumivubupiba.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/12714123208.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kfun4p29b965bg3cvv2r96qe83/loxinelojazirutorojek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+answer+why+you+choose+this+jobPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 10844 bytes
SHA-256: 223314f5e3b68c7ff87edaeba0cbed319d8947d0d3179d37df12e93fee2b8960
font_01_sfnt_off000112dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DD 17172 bytes
SHA-256: b1b5234a083314fc19fc6876502ec9d0762d6a1be49a41b529b73abb010cec36