Malicious PDF — malware analysis report

Static analysis result for SHA-256 3556078d2824e152…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 13:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42c194e1aca347c203b0ec9fa8dab984 SHA-1: 98f1af753841d817c046bf0a129848a970b3b488 SHA-256: 3556078d2824e1525bc2f1cb2f30976809ab29f6aaca731ffa1843abc4ef61ba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/21b1287a1a684fa1490d50577b9e1eef/15528251013.pdf In PDF document text
    • http://hanasushi6.com/uploads/files/46518157087.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/55497168422.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/32053648089.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/nexovabodutejunopadu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/vesusigatig.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/50854909242.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/84156491201.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/kakokosetilosafatalir.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/36620609867.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/89038320944.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/mepewulo.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/6964654527.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83432474883.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/vuguza.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/50243272991.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135729a7bf06---sajumebiduk.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/62716409291.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109090507223928.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/67789543520.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161356d2f3ad57---65126147369.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d046d925b4a7a985586fefcde2671e41/xobekodumivumukijapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+walli+wallpapersPDF 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_off0000baf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF9 10160 bytes
SHA-256: 12f66a06e8f2a83b0ae80fd31f55be8081269fc290be04ab0edf28a3922633e6
font_01_sfnt_off0000d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 16132 bytes
SHA-256: ff4e948b503ca69601c1d0adb442f01a95c83aa1d79e42f95e001d8370060fd4