Malicious PDF — malware analysis report

Static analysis result for SHA-256 d307560508bb45ea…

MALICIOUS

PDF

70.5 KB Created: 2021-09-14 12:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd2fe87ffb119ec775c7c995e63deed8 SHA-1: 87537660c1325ab3cdd45137a290c5967da5b0c2 SHA-256: d307560508bb45ead7e40696dbbf6a4bdde855c16c559d61f8a8c96203a46e0a
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDF files, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to obscure the true malicious destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=uk+mega+ramp+mod+apk PDF link annotation
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fubisew.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/vasur.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/rafezaruruxaxaniz.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dixubosifuku.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/47482233022.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/9781743319.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/15549638883.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/osqjpcrmlff0h7807sqg2k1np9/72443259789.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xuvefedoxe.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/56748943992.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pejubavivi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/61516291488.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f9490939---xemolatasifetopiba.pdfIn PDF document text
    • http://elpijisystem.com/file/53807017965.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/potogavo.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134cff46de6d---10219745993.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/42a3370b47213c7b8ba1f65b58fbf88f/xurovawud.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/tojidopajinobiwopuf.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401bc4de384---dabuxojoxebik.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161305bdef02cf---39735890474.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53093280819.pdfIn PDF document text
    • http://kccmaul.com/files/files/xabevuv.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_off0000b567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB567 10328 bytes
SHA-256: 9773fd40fba76fb8e83283f5069941c5ad2180b9c327b2b951d454112eb8bb58
font_01_sfnt_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 15804 bytes
SHA-256: 3313ff137cc304164992b9a4266969afe89853f30c4a91d7adbd18283f2af666
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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