Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae54d56012b3b08…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 20:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0279fceb13163b6c0a3e4d56a8c9a29 SHA-1: fcf0268cef7c6e2cce43571b0d4aa4790143bbd7 SHA-256: 8ae54d56012b3b0877a8b80f56eb59297f287c68323b0ee423d78c2bbce777d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites and potentially disposable hosting. The PDF contains numerous external URIs, suggesting a primary goal of redirecting users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate initial access via phishing, likely by leading users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://huntic.ru/uplcv?utm_term=business+english+reading+exercises+pdf PDF link annotation
    • https://marblo.com/app/webroot/img/files/65237375611.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613773e55583c---4319890820.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/83585366996.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/78751535832.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/32943556779.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/rilosed.pdfIn PDF document text
    • http://kustari.net/userfiles/file/ziginarorem.pdfIn PDF document text
    • http://rotang.net/userfiles/file/329039037.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/30871924993.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109091203564035.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/getezetelebifoves.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109091632308399.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/70826104041.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/lidekufe.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3f3ac8d28af54ee993a990852ed8da5b/nozopidarumesimepoduwu.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/31081559077.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/vozijojajon.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613add11a06fb.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/baponalesaz.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/pinagun.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/42578737152.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/lotuze.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/94200220559.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/rigenitovasisux.pdfIn PDF document text
    • http://sentai.cc/data/file/20210918_000030_774.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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 10936 bytes
SHA-256: 8e7812d324879e54dccbce73c44df72322eb00169adde96e6b703d6e29c41b46
font_02_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 17716 bytes
SHA-256: 8e674f865e595dff09ed21a1800340c10e57c6c60a72e02f8ebb6db1f0ac11e0

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