Malicious PDF — malware analysis report

Static analysis result for SHA-256 6846760d1c907035…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef10fee5897f33285e58ce4b1ab50c87 SHA-1: d6ef1177d5876c41c56bf8967e52f677a7d72332 SHA-256: 6846760d1c907035f8788392deb5fb4514a7516e97a55d3f4a0f74d0d3c4fac5
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded URLs suggest an attempt to redirect the user to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d161573f2c---40465562316.pdf In PDF document text
    • https://durimawar.com/contents/files/9037125713.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/31629672430.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109121044567135.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k3ohie40cg4nmdtib8scs0ik99/jefebozozus.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/pelewokodalalulegeralen.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/jipulemenes.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/funefegiwepexege.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/2071276078.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/44904436952.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/nalepifer.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110f7a054d---51351535538.pdfIn PDF document text
    • https://coevent.ru/upload/files/lisirukomibidegedij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef5616724f---44682689010.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/pogesawanafevuvawa.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/95133174975.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/67593673061.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/kosasonanatemodinubepito.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/vinavi.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/430489858.pdfIn PDF document text
    • http://guchen.ru/d/files/89119081237.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/29275679415.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0b07af81---60394057451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+restore+pictures+on+androidPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10640 bytes
SHA-256: 236ceaf4aa094c018cce4e6ca8407714571ed9015ea20a563d6c8ce7b11d1877
font_01_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 16652 bytes
SHA-256: 1212807f6662e2e58fafe82b2f165e26577b091f61fa451065a9276949bac88e
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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