Malicious PDF — malware analysis report

Static analysis result for SHA-256 6894f88dbe24e934…

MALICIOUS

PDF

91.4 KB Created: 2021-09-05 00:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fb5cdb4f76595c45a70f0f0c0d67fba SHA-1: e27d7a5a6c1bafdada93766f4df7d8e0b0821d0b SHA-256: 6894f88dbe24e934d8b845826ccba682ce72d12eeefa987aebe24ef0b613b272
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078955008f89---xijiju.pdf In PDF document text
    • http://www.cbs-emballages.com/upload/file/39767934786.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/30674468026.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/wepokafarupapuwozetori.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/37f4698ca42517b198fbd220f9e240d1/ganabiseridutojiwafiger.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kadetof.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4c2da5b338---xuvetavati.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62521989f8---walupanovifarusi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/03c6c2a0c7170b81c02acab3cadfaaae/33453208622.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/suvapo.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/9350790071.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904124535785164.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/fe15b4fd8d84e260e57ab4ada4252f5e/fibipidodavikudorukuf.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/lulifelakedinemone.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d1c70aac---tuxep.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rinejadewef.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a0s34l95b4o3kir29s14c0uncp/xewizubokopuxu.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/87910335.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/94083542833.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kfqdp9ucs7d5dhf5b4nn43aic5/23282238795.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4269e7e1b3a3f61f524bce4f3801471a/nabikejetedulaxamo.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/6fc1b22a45aeeaa7eeb33dd77f409b84/kejesonig.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/74771942484.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210813200143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=acidosis+lactica+clasificacion+pdfPDF 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_off0000ffa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 10364 bytes
SHA-256: 2bf532b44058f16c1e0c4ffb81980faf27bb775deb248d9a478565a7e5c2b33a
font_02_sfnt_off00012f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 18780 bytes
SHA-256: af4d179a26ca8a5dd8d3cf17d182a7490db4eeed92f9e7baf46652fba70c1a3a

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