Malicious PDF — malware analysis report

Static analysis result for SHA-256 751cf39d3f2882fc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 05:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: be7de9dc93b9c76ba225a372f5cdbeb9 SHA-1: f56db6fc07edee626d24bfba41792dad16e91ac0 SHA-256: 751cf39d3f2882fc2d0e3fc8771cc4b411991ecdbd6602acce21281fad70741e
164 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised websites, including WordPress installations, suggesting an attempt to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as 'Pdf.Phishing.Trojan'. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chezgregoire.fr/userfiles/96564859911.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6ee0b3088---32578281136.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/59315224604.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i6l4e904f245auqpld6t48r1um/toweduvuv.pdfIn PDF document text
    • https://badrivishal.com/media/sosafukujosabepotaz.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wirerosojeruzi.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/juzusarokexu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3acf46c62vrl02jeo5ljehbdr4/65183792916.pdfIn PDF document text
    • http://toroisg.com/public/images/files/likikabo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/lsphu04mmqo8tgjcc82bnf8j56/84635147417.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/7qpd4tl9r4okl37p77q8jl2jm8/47977044784.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/afb02be439558e585e27d8d01034684c/ratumi.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xesererigudarojuxi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f58acb196ae39491aabbab3dbeceeef3/94950370694.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/zarovure.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/gabiwutupozapesija.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608373ca6e0a8---bokosolisapurotutizu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/mp0da4vket7h2q4jauvfmpi0t6/4842683170.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/tagiwivizabutipe.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099511db11f6---firanipiliveposejo.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/23449842459.pdfIn PDF document text
    • https://sealskinz.ru/files/file/madototebatefe.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/wegiz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4ef6e0d1---53763137790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+gearbox+meaning+in+urduPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16948 bytes
SHA-256: 1fe07a4084cb080c37d8f1e91ace7844f0506319f47cbeda32cb06fb7040fbb3
font_01_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 10660 bytes
SHA-256: 579897c6905d1692ba214323bd0fbd37f16cb04f12db0c750f13bbc46748c106
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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