Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7f87837271dc9f…

MALICIOUS

PDF

74.1 KB Created: 2021-08-15 08:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a89731b449c4e01a228ed3c0dcd622e7 SHA-1: 3dda015613355387ca1c1fcf4a20d590a7edac2a SHA-256: dd7f87837271dc9ff3de07678b2b14453e413bff0832b2056ffda364d1ac1b92
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious sites, likely for phishing or malware distribution, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=agar+zindagi+ho+tere+sang+ho+mp3+song+download+dj PDF link annotation
    • http://sochi-polyana.com/ckfinder/userfiles/files/zosigitoguza.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zutugi.pdfIn PDF document text
    • http://hotechike.com/files/files/sigalunusamarikujanaj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/69b0a94d67b06e2616bca3f1903c4f79/pibinesoxuzotunixegevoni.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608118dc567fa---1702369.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16086a91160d34---tuwosototav.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97607031816.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/mujopomemawufovanibi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/clo92hkpf4fnj1jpdfv5u7qc52/bifirenon.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/josiloberibolubojirora.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d0ee5cde981885e5fd0aae8057455545/zorawu.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/pozopijewinatukewado.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/97069867687.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71d396dfce---funafekosujaxalababiv.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/168fca1387c73681f5376c92e9485275/34322329382.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/zovoburabalevajiraxeg.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104a159c24eb---10819415275.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zumabiki.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/67358044070.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/53262303011.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/gupopiwegizana.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/hukuba9j3vv0lg48nfocb596kn/dobitapegafew.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_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 11268 bytes
SHA-256: 28af598e93703827270f52d3d01a43b1aadeb049a0055972d69787cd2d105904
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 16560 bytes
SHA-256: 36ef546f6fcdfd5e5fb91cb8677911ce67c6828a66444abb2fe344230349acec
font_02_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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