Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eecf009d281936…

MALICIOUS

PDF

97.9 KB Created: 2021-09-04 23:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0ed3a4cc468b9db01684bf2903a79847 SHA-1: 197957ca53adc4d0bde580c8d010b4c73cf7f4f8 SHA-256: d1eecf009d281936d2a8acf1d36a307f0c7669f95bce5c1fac775e4503b68ac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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 http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/xafafa.pdf In PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/felinedis.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/77960000947.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/73888615779.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/baf1cbfc3fcf8e106794e5271e251cc7/63102531644.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/tifekikid.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/0e29353747ff41ba6d192d2351b34c3a/13678390266.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/5122d894cfa76a46f9b176b8e7c51b1c/66694908258.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609db8384c606---xalizuzewurubatinodil.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a0bfe089a10e0d9de4bc72cb50af89c5/welezizu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/74599589074.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/bitaros.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/vonupu.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/lonaruviposufumewe.pdfIn PDF document text
    • https://bataretak.com/img/files/file/13406926443.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/paxebopupolegixad.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/52996825362.pdfIn PDF document text
    • http://ippon.lv/uploads/File/54746667764.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/94120200484.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/198e929d4196c90895a5bcd31cf171e2/88243656838.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/nulap.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/28527641258.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e910cfa757481a3664e0a731efdf461b/woniwakofesimizogitifojin.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tiruxisobejaxazik.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/13008619434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=khutba+e+juma+with+urdu+translation+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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 11208 bytes
SHA-256: b252027c8c7afe474b3303e664dbf369919fb34fe1c51196f9adfcea1cb27290
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_03_sfnt_off00013886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13886 1760 bytes
SHA-256: 5fff00743cbca99111c2a7ac28d1b3d5d8f2da3a717fbbef75202c4a137a6772
font_04_sfnt_off000140cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140CD 21768 bytes
SHA-256: 894fa5115658df33ec9aa59b9f7a9c1b9b449b67be4b5d4477894ca5b2fb0414

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