Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1ee413df0547d4…

MALICIOUS

PDF

126.4 KB Created: 2021-09-05 16:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2432132c5fe989bda4b466b2bd99233d SHA-1: 467f172b3f03e0f1e0483b31cd6d79bc50470a7b SHA-256: 7b1ee413df0547d4de637a9b90412934b59c56109e2203b872a774e170b8a261
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the PDF structure and URL analysis suggest it's a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=dialogos+y+conversaciones+en+ingles+pdf PDF link annotation
    • http://uhli-janmaria.cz/userfiles/file/fokewowabadi.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/dufipoxa.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/kk69vga85qp366gv62rjfsspe1/zaxugatosafi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cdeb334b0---fakafazipuxun.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/29071882280.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/tubav.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/26151998940.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rrfjhcqu9bhc5s3m6m64i4d421/jivarakafaj.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tafutosupas.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2f0c5696c8213fb2b9aada7874a5e5cb/virafe.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/vadikiluxunolajubojate.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac37daa09c---12931959431.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/17715366119.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef499a0735---lejimemurujanofe.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sogevabaxolulitolumof.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c886675c07b---47466938799.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/xavonotof.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/1001450491.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/46585276881.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/99cdf71c9a95b6abccfa9fa5c6545851/58407930694.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/solodetajemapev.pdfIn PDF document text
    • http://eko-uklid.com/files/file/bitiga.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/61923295135.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_off000186be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186BE 10880 bytes
SHA-256: 4a3a08b67de4a82fbb3795bdc5c5327ee36090fb8e3a71f01818262991fb0440
font_01_sfnt_off00019fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7E7 19456 bytes
SHA-256: 4d5fed56b555ee35d629a2cfea5154d7ab4739c13de8d03b0c3f82dbfd498143

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