Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d15663c01b0a19…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 11:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d0b6d35af948dd9c74c71a21bcc14af SHA-1: 1032b2f01ee52fd402fd5ea88e1bfc6876747458 SHA-256: e8d15663c01b0a19e760f94ef1e2ff516d14c55c1d3f523d9c56c6bd80441650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links suggests the primary goal is to host and distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/13b6b2375105717f4747dfeb22c9bf8d/27914125960.pdf In PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/34013356549.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd0b97a8d4---wilegewazakenadofabi.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/27455540164.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/887076705.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/64d6c303cbf28a03a8f04a7ef93c76a9/94599776585.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b53d94cbeb6---15819141227.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5da602b8506a37d70c4c364b7047963a/1368459054.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/54976208991.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd80638b81---72016475265.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/tugitowoluxonifumo.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/52697664500.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210807110105.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/vowolowowalofodanujijurem.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9m8j2vps2859ct4vk7munkg01/bumodinogomixo.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/buviduneriseralas.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/87v1rsq0jkl606n1t67895992k/97382748522.pdfIn PDF document text
    • https://birudongker.com/contents//files/vuvamezemilap.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/guwufedi.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/55581514979.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021080411033462030.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a2jcobvtkd80m5qnl97k8kaisv/13622447582.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e7f10dd5---wenetiwasubav.pdfIn PDF document text
    • http://zae.me/datafiles/file/80122578630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=slots+era+cheats+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 18404 bytes
SHA-256: 521dd8102bca70c191a3e17ca4188fd24b30feebd9c7cb85e93409429128a9fc
font_01_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12617 10296 bytes
SHA-256: 0df5f62b6d361dab62543b43d8e25ab4b36515ad18be925b869f490c65ce5011
font_03_sfnt_off00013d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D60 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082

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