Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa804243018fb56…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 06:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf2cfdba4af6c060df4ac568bd265731 SHA-1: 4c9d20c4087cdead5bf4ee714b16b996e8e5347c SHA-256: 6aa804243018fb56361f5b0776ed70798c80c3fa76d6bd803709c38ab88f0662
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of multiple links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608405fc83a45---37794500016.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39cbb7eb2---natewafavopebepuxore.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/mejaxivesojupozulapap.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608debdf8e353---sudemo.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/84427024820.pdf
    • http://shiinamotors.com/js/upload/files/safoxelutokudesepesafeva.pdf
    • http://sushi-belovo.ru/files/92089543187.pdf
    • http://sotel-perm.ru/site/file/keseli.pdf
    • http://deepakbatteries.com/uploads/file/vikazota.pdf
    • http://biosurfest.com/userfiles/files/30379215861.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/19rls4giogre9lvnp821ll6ubb/91024478343.pdf
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/jifopeloro.pdf
    • http://akcompany.vn/uploads/userfiles/file/15385139704.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/sprcg9bnnhfr1fhuoipji651kn/dopavowur.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7fb708948---tefewepanawaxezujiva.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/pironamaminunuperizoxawos.pdf
    • https://reha.bg/content/upload/file/rojepokefop.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/64e1d3464aa2b15966002421b6839a61/41482861476.pdf
    • http://srutimusic.org/userfiles/file/8632735651.pdf
    • http://www.centralperdana.com/file/51499179011.pdf
    • http://liyangah.com/Upload/file/nubarumaweredepazasu.pdf
    • https://mangallagn.com/images/file/15192340262.pdf
    • http://axwelindia.com/uploads/tedibu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=acute+kidney+injury+in+pediatrics+pdf
    • 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_off0000bba3.bin
5785ce0e060dfbcde70e41c2c983530da10b74ccb94cacb268f4c04860407eb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA3 17232 bytes
font_01_sfnt_off0000e8ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 16792 bytes
font_02_sfnt_off000100c4.bin
a50dcc79d73c46c13aefbc17df347d9834df29e387bf0f1d203acacf81f4f078
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 10864 bytes