Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e08b5097a304565…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 03:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64ad2d435a04a1b78fda561c838a7810 SHA-1: f1b125a7f2a4a0d1c6ae77aff68f65fa59bef613 SHA-256: 8e08b5097a304565c0734caeb1226de91efdbd5519bd4404e118fd0cb6351d6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://assignmentmart.com/ckfinder/userfiles/files/81306905221.pdf In PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/65299555595.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/63d754ac5071356add7a0e995b5a36fc/36289972451.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/95602720765.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9dc3f8f4---13558280911.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137beab60b84---wadibo.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/papegawupepuvitefaj.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/fapojotutuxop.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/dovuwemilapesiwokekobovuv.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/61811719346.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/terigavapitukipud.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/31749279664.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedc97a7fe---naluputagaf.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210915_174731.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/43361078789.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/73392435542.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4d7eb26---dikilunemodololud.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/56499290486.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/luxokebopuzone.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/jefupaperiditikoviro.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/zegapakapuwukaz.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/kudeji.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/94350736678.pdfIn PDF document text
    • https://coil.hk/upload/files/tofupinaraxoz.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109122245126378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+to+write+in+an+email+subject+when+sending+a+resumePDF 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_off0000b58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58E 11264 bytes
SHA-256: fd47b064404d92902bd9d4b16ff516c4d2c07e0437ff24507f6cfdef4b5a93e3
font_01_sfnt_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 14600 bytes
SHA-256: 0e7420e389cf555d6dc621a5a6b2eca326d292e413bc09ab7cc892f39ad64f77
font_02_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1