Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a6a155f67ef1a7…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 03:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61ca33c12e4b9f81afd5a1578135bdde SHA-1: 35fb2a380f0fc3539b2a3da0409669d997e189ad SHA-256: 54a6a155f67ef1a768e599c0efbd58a6c59424760cc9414e2ce5dd7c52a1bd83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links, including one pointing to a compromised WordPress upload, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://yushendesign.com/images_fck/file/1631221949.pdf In PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/genigegugired.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/80835206837.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/2072454537.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/63069051443.pdfIn PDF document text
    • http://stylekd.ru/files/63986728983.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/71370821750.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/vikulevekuko.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/tudol.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/nisekezujoviz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/267657262b9ba82e4d3f85df3e01f7b9/13066776046.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///falebalikikowetenepazis.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/juwurolesexoz.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/95926287812.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/dekinosajenudafarilewabo.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/tatotogedixawemoz.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/23844395516.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/zebesunakakolejipesezaj.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/xotuwesagebizi.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613348d86cdb9---wawenusibamujolazoxilegu.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/c09b8231d8991317172171528ed9b49e/wudakikaxox.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613746bf1990f---50508297785.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/bovetag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=is+kale+and+spinach+the+samePDF 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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 10604 bytes
SHA-256: 31973a4075c3c8f34cd9f8be96517190daa0f1950b9575e3a80cbf2aac71773f
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 16816 bytes
SHA-256: da1b37c7054aaf7d3e5b600a521a1bd14bbb517dcc0095a4428b38f6a432f8f0

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