Malicious PDF — malware analysis report

Static analysis result for SHA-256 12270e5063247e38…

MALICIOUS

PDF

85.0 KB Created: 2021-09-02 08:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbb55863ef0e307cb1c0f25f800e2ee0 SHA-1: b74a879fb6a417201f432e3a9ef269ab40643a9e SHA-256: 12270e5063247e3844ce7ac82640e0b15b3a64f9e26eb57b1ea2e1f41d991e5e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides a password to decrypt a subsequent archive, a common tactic to bypass security scanning. The ML classifier strongly flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://medvor.ru/uplcv?utm_term=i+was+treated+for+gonorrhea+and+still+have+symptoms PDF link annotation
    • http://hanart21.com/files/userfiles/file/36414173390.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/34043708383.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42a4c71b---14745602980.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611831f864d4d---37583497272.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1rhc6kb9mph8epf7vt8ekikjpo/40387573100.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/fijaga.pdfIn PDF document text
    • http://cjatkinson.com/userimages/38278829745.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/sevojizebirokuf.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/3ofa0436f9rnbucp2g99nkj886/lodaluni.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ha0jt70fnkja9jjlbvqnt0bs0/31497109236.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/44731777838.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/padesinomabusas.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3d6ct1vknj0gofo369urgg8fk9/30136839562.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/99190830518.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/lelinotex.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf1bd4646---3707082052.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/wuxumib.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/88466663911.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d8d279cd4e16a8b9753d27f072468bc8/lumokudorugizofideperew.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/rasixuwagujoton.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/11692023068.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zavekufusezazivebome.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088d1b64141a---fawujekibev.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/39bfc8653c39acc2a2354992727cffc6/kefubexeroboxovozapani.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/sivug.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_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 11160 bytes
SHA-256: 8892456e4bba9db1c5f58e919c6c14546e70fd9a24462c97558fa68b5a0d55c8
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 17316 bytes
SHA-256: d7a2771f9216e5c00286f4e9e21621d4e8f4c133296a76f6a939e43552caf2ed
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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