Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcd978ac84bf40a…

MALICIOUS

PDF

66.3 KB Created: 2021-06-17 20:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: acb9d8efb4583dd94def490321cf8009 SHA-1: 51819f72d30ae2dbf0e127ba682de5caccd6c6f5 SHA-256: 6dcd978ac84bf40a5fa82a5c7cff6f5d0de2675f59a7316bb6e703dc19478c57
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document's structure and embedded URLs suggest it is part of a link farm designed to redirect users to compromised WordPress sites, likely to download a password-protected archive. The presence of embedded URLs and the overall structure indicate a phishing attempt, potentially using a lure of an 'Nta net question paper pdf' to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://studiopros.com/userfiles/file/ In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/o5uk0he2pnc51rnvc841pgv54q/mikumuvonawamumobivi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e673ca7b4f---dakimolom.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/75a7491bf361a1d485108edcb527c311/wodeleretelunibow.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5d3bd5bfe---29429575635.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be15ee133c---72459891891.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b183cdf99---govemamotixidirojekovedaz.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/vesipozob.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/35218679937.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/zasawemukanusekegane.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f2f27a2a---tidijuvumilapewabix.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa8fb70256---60636042922.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/fa3db2ee1194ccd00d871dc0fa392aaa/gevujijofoxerototekazesux.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/89867892239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=nta+net+question+paper+pdfPDF 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://scripts.sil.org/OFLIn 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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 5096 bytes
SHA-256: 430cfc6e1662c37096473e436701cc7d7dd499e12c17c294f6e66fe7dfb14119
font_01_sfnt_off0000c302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 10500 bytes
SHA-256: b8e7207a90da796dabb61c6b05daffbdea65068ef0eddf3a6958b8238eb1481b
font_02_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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