Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff00b88cb4958da…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 12:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f39c811d8cd6d96b409cb41cf57005ef SHA-1: 8d763cda43da3a28f8988eb87efd53c4ae8b0d6d SHA-256: 4ff00b88cb4958dafb8e47f8a5e78f96b50589b3deef86f78122a05e6021b4da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting sites, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://allytemp.ru/uplcv?utm_term=american+heritage+merit+badge+worksheet PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22664cd9ba---41423229724.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098429106f09---48157812985.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/vajigub.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/57425336532.pdfIn PDF document text
    • http://punaide.com/userfiles/files/48251670955.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/93457878993.pdfIn PDF document text
    • http://www.nomorcantikspesial.com/file/jomifutalepitixor.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d044efc2d285eeb88c59e450feed2e75/99421618027.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/wigiwesotujanukitarefura.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/tudunopezen.pdfIn PDF document text
    • https://turbooto.vn/upload/files/dosisotepokinugejugikatun.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/31753364095.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/92053487766.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/matanuboxabizuladubaki.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/nupatixobamax.pdfIn PDF document text
    • https://telenovella-bg.com/files/29181338439.pdfIn PDF document text
    • http://promador.pl/userfiles/file/43822708397.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8224e994---89167834230.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b06256a519e---6204157691.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac65f03df3---fevujopobavefetubelewizi.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/somaboxetu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e4f40ca0---73606129673.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/misejekokipojigexop.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/epugc6a5kmv16l9ms56rb64kph/28533329972.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/88833712245.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/69724366457.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/17140414336.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_off0000f69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69A 11068 bytes
SHA-256: 280886f1da3e5fec61c6786a213de2808552abed95338c55900c9b4e225ff4e3
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 18144 bytes
SHA-256: da75537105257e9637887cb66df58832ab91f0d054a885eb569dff8955362901
font_02_sfnt_off00013f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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