Malicious PDF — malware analysis report

Static analysis result for SHA-256 8189ccfe5678bd18…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa619a96ca23e6a9e33a77129ef83998 SHA-1: 06911e4087c76b56b7c4365fd88e3e2c2e5e46f9 SHA-256: 8189ccfe5678bd1857fdba4ffc9fe421483052b6a022e07e03604699a2886169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may embed JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=best+selfie+app+for+android+2020 PDF link annotation
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/67362418310.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/laxakebanopidazubisupet.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/35e2be8acc59bf77e9cdc550eea71e72/82045729203.pdfIn PDF document text
    • https://beautydent.hu/editor_up/vefuravufivosizujozenigom.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/wegazogokuwafejuxe.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/wozujigipolefaretu.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109082053438636.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/jakufuta.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/wibasivilakobiko.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613086815a857---gakiminofewesavuwerux.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/bufokamupaguwegukemosir.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5tqh6353si2fatf35puelj2fj/67801195723.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/87438412523.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/56938254963.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/78108077545.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/97765712538.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/jemegipegezuxibaw.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/krfq9rvei5gvjd5umu2moic88f/36671889175.pdfIn PDF document text
    • https://tivicom.vn/upload/files/lasapomibajipeneg.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/tikevobajazogazizoronetil.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/94330053237.pdfIn PDF document text
    • https://msvadba.ru/files/file/bogidipesowowikarewapuveb.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/49343182284.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/mojorow.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/jufexuzirukegapibosuzol.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/16026029127.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_DF9D252620F44791.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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 17448 bytes
SHA-256: df7087e06e66845504e8ba0bb744477a2588e606800102d5a8adf3e3e95f3f14
font_02_sfnt_off0001371f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 10784 bytes
SHA-256: d15108c66bd2f88d0f4e85d2abe16a5491791e7457be994d4f6c1f7b3415a3bb

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