Malicious PDF — malware analysis report

Static analysis result for SHA-256 1497542c544b8c6d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 20:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94dcbbdf434207c9cb1572374fb82dee SHA-1: 3f7e49d6cb68510f922fdc81e496a6a2f1c1f527 SHA-256: 1497542c544b8c6d08bbcaa87562e484a69788ce87b8233915742ecfe8bc856b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://actorconseil.com/files/file/84044727878.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hgl1kfd3ra5hlje8haaoejtvu1/gisogusilamejixizakugi.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/93155367793.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/30471939746.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/69417142441.pdfIn PDF document text
    • http://szpk.hu/_user/file/poxotegiz.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59b116d58---wiwukiketogodejeluweri.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e7720818---megebobaxowanu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc2139dbe---nejugowikogok.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/81549216568.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/nafawodu.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/xogobufewidudibazifoluv.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2b6ab8a6dfdde795b71d501f720646e9/japanuwuzitabebajovami.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ec72366b7---fokiwemejer.pdfIn PDF document text
    • https://mashura.co/userfiles/files/49250259597.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/trp17ftnkpuk2vkhd8p7bnft34/tixewafomo.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/29360540821.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070105350188.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b34b5eb5---ximofipovopudupetejilala.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nnkf7gj368qgti9ou1h6plclkk/48564205728.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/94293991371.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/kozoz.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/141e50815f2d3b079001ebf324998c3a/28735862607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=isaca+cisa+book+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_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 10316 bytes
SHA-256: 62209daafd464b8ff1c6a1aefcba52ad95db01fd21ec4625f8a01558043c36ab
font_01_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16596 bytes
SHA-256: 80878487dffffa33906c9668c66702fc27df8ec04ac4fd7400c0f819bacda322

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