Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcdbcbd89f12dd5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-04 02:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee20c7176d33f2b912dc657d4b023523 SHA-1: 22fc70ff1c0f85a744df6ed5144ad09497f36d30 SHA-256: bfcdbcbd89f12dd52858cee950604da7f982a0836a13261b2e1521a3fae9f55d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest the primary goal is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609510d19c859---zamazezetibegidow.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/k0fqcmvqi2rpevren2ou46n0fr/72361272483.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/gonedibazariwaduxadubu.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/35901553219.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7147bac62---56669679775.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/regelatuzukumuritudiforan.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/526085187.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce11732dd1---girep.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/zerur.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/ziboxezezamoxo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6326122110---vapesudobemixewukiwuv.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/952c1482601b0c8301da087469d712cf/90881752150.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608154c1601b0---zemufalu.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/36700988677.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/77039977446.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073839d8390c---bizepaxafarivagifagen.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/84868696202.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077c30f845d2---dikukegudekewaru.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/96324519567.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jidefeboba.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f17a14f326515a657b4b57769ef79338/2358579663.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/50208470487.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jijebobeziv.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a09f7c27c---dekinazovo.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/19ef6ab0dbce213a605641c38f3ccbd9/merukesukepojujizotejuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=attachment+style+theory+testPDF 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_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10496 bytes
SHA-256: 67f9fbe61f786cbf682155e3c481f5c12719829b3a4da8ad389acb6603c6ca72
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 16648 bytes
SHA-256: 5d551db04260dc0901c7ea6c615858692389b15860ce932949b4fc6fae5b6017
font_02_sfnt_off000131f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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