Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7518a0fcfa7a7d2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 14:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc617b6f65c1938a15e3eda51a9d7419 SHA-1: a68f7660edae266719f85aba8a4c537119547f01 SHA-256: d7518a0fcfa7a7d232f7208fd91ffd9d76e0847c704e58def9fc1f87301e49d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kurskodkb.ru/page_edit/_samples/userfiles/files/31537979232.pdf In PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/kexofopezixufipuvoza.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/66671199712.pdfIn PDF document text
    • http://hak-al.com/resimler/files/vumekezudokagimabavoda.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/fusirufizutodop.pdfIn PDF document text
    • https://maisonforville.be/documents/file/dojubuvenugiva.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/nexakozikumiromubum.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/19339983100.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/xiduwawotigagujoruvanitax.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/bupotabonewagugap.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/25134551083.pdfIn PDF document text
    • http://rentaruedas.com/files/others/76778581678.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/9297428858.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/53331703227.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/pagebovavikulefujave.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0b0066ca66e6af52842c9cee2d758765/14260594148.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/18719094092.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/pipagofodoxifapavitef.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/jevikakarabagefipezusas.pdfIn PDF document text
    • https://emprenderem.cl/files/39274434868.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/90888889382.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/eca2db5d18319f0767a1a6c9b984aa28/rufaz.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/91055171653.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/96310016394.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c960edb06---xoribefisozi.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/joluzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=teenage+engineering+po+33+manualPDF 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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10564 bytes
SHA-256: 258efb5f93c51f1a5b97423a539706b265a910cc95d7d66f00fd1113b04125d3
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 17060 bytes
SHA-256: eda31c59b889589018ba922e333c8990a89d4bb73011c9aeba13e3d59e197674
font_02_sfnt_off00011d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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