Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb4658b328206e1…

MALICIOUS

PDF

87.7 KB Created: 2021-08-06 01:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b62122493022725a1e2aba932925b04b SHA-1: 38d218a7d53c16066ceab17603204a17236180ab SHA-256: ccb4658b328206e1d10e76f4a96f1c8ec03666e81151f595fbbee87916fe1e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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
  • 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://cructi.ru/uplcv?utm_term=minecraft+hexxit+mod+nas%C4%B1l+kurulur PDF link annotation
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gsl1pdg7c14scps31jt7tfe67c/2312197466.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/13502bf888919bb3b42611b07554da25/48018506039.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ad0c1526---wusiboponorolo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820565b45cf---42905917328.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/52720833713.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2da79ce72509e940e90862fa0556ca0e/vabitijebabaleg.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610456b34e9f2---61489590753.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/tolevomiminepomasamoru.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/29433109490.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/nutokilizisujimomawa.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/nozemusizusobasizuralef.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/mudekele.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1f6d9ca1---mekusewalewuzaji.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/pevejeniwi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/4o388d2lvaucumoplqo0v05ql7/49443383705.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nodafigajif.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd816f8028e---tegusugafibata.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/bemutofuvijodomod.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b101c028947---kovasubakofijawukawuzu.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/nojoguwadoxuwafa.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/98566735371.pdfIn PDF document text
    • http://blueyee.com/upload/file/141137104042.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/83818904266.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/gixopobakemunapu.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/84970716964.pdfIn PDF document text
    • 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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 18828 bytes
SHA-256: cc909c00ef6ce2ed04b42a9711d5d9315aca870622eb1a3014d03e95a3f150a3
font_02_sfnt_off000134b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 11072 bytes
SHA-256: e76954e9955e406ce493c108b2dd0d32b84244a5c204869b5fffcaf67e0f23cd

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