Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd6d256a30039a8…

MALICIOUS

PDF

90.4 KB Created: 2021-07-16 20:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 245bccc4ecec33e29c9fa24520e00fdb SHA-1: a61a5a159fdab10572870c2e93b1e3059a778d62 SHA-256: efd6d256a30039a8622f8193cf808995955fb35cb9d40e757ef854a47c7b29d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content. The presence of these elements strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aao2c084gk64r13avj49n8t6ct/jenilomawoxoluretuzek.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bgc10dmmacd988jm34dpt8m2k0/59382425840.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/73168015824.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a4cd8840---96211959572.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b453009fd9f---27920013136.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/valalijaseritazetura.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/64659b4dc7388813d41654fb2bde4dfa/towed.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/76827261776.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/429565dad5e6d9fd30bbfe3594b1d85f/muxukebegaputawudi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/disumebosomaxiwafoke.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b379559a74---2084789101.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vlucteubeck52q1p855i9s7bv4/bukifunor.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/vesiremolenul.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16232444752503.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/16609753131.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/82218632027.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/98551400448.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/romuli.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cflnmjor35dh62daicbr8v88ha/67083502610.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9841aa9989---zetutipetozinediwufa.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/jolugeridi.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/krer31v4felvvcdun6u6g35ope/56377306593.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40f98ea14a---jikufetewupexabarakab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=capacitor+charge+discharge+equationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 11024 bytes
SHA-256: 3a945214d166414271b9a5201b29739ab4c81a9fbedc11cf3d909708030f7a62
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 17540 bytes
SHA-256: 2c47a82b4344ca4a5a8efc688862b2cee679965e04947e23be20d0ccb5d6e764
font_02_sfnt_off00014436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1