Malicious PDF — malware analysis report

Static analysis result for SHA-256 358238efac3d791d…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 17:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 648b8a40c7f58b1f58ba0a156f5a63c6 SHA-1: e64e418d8c1b99b5ab9d7eb3570500bbfb24f354 SHA-256: 358238efac3d791d349f6b03abeb167266a29c616f79bea4ea9b708ee4250710
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and a link farm heuristic strongly suggests the PDF is intended to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://tolltisztitas.eu/userfiles/files/71111846690.pdf In PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/55674064473.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kemozodisafu.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/ronobefumune.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/51482070280.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/dakinawodonafitijatavala.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/wivokiximotawolovir.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/18796187628.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136511925119---86930468009.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904140720.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b2c69eddd---25125124016.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/22288014756.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/debiru.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/061112478473.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/29471669772.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/ropugoropitexigurojiwom.pdfIn PDF document text
    • https://kulittelor.com/contents/files/64436906677.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/93375298995.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/nafevofunokojojazexam.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614819ba9aedb---8002105376.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/17444311587.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/28804735470.pdfIn PDF document text
    • https://majubesar.net/contents/files/29237547205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=slownik+polsko+angielski+onlinePDF 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_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 18992 bytes
SHA-256: 41b9192d473ed18d47a72f9294ecbf4153e8e15e1618397479bfdd401579f128
font_02_sfnt_off00013512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13512 10484 bytes
SHA-256: c86fbea1df6f670a543ae4b95557aeab3e146082ee9de4ed48faaf487be38650