Malicious PDF — malware analysis report

Static analysis result for SHA-256 d360d2a57414cd55…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 19:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce41afa6f2c50b44ada10770850c3b4b SHA-1: c7ab6846cc30756889b616f72cbde3fce2a3e4c2 SHA-256: d360d2a57414cd551fda1982c58ea8456e782578e3435b39964d76130bb9634a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. The document contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate a strong likelihood of malicious redirection, potentially leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://macroedunet.com/userfiles/file/81651608217.pdf In PDF document text
    • http://ptichile.cl/userfiles/file/vudavitekumawo.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161313c93c989b---86418261612.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k06b9vjggpe40gn85cqfvebs12/39017065989.pdfIn PDF document text
    • https://tomas-music.com/contents/files/bosimeva.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/wafuzabugamumesep.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/6a9bdb939f46870daf8671c5e889aa0e/tidadijudovode.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e1127ec30---98184697257.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/11053376442.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/gazomal.pdfIn PDF document text
    • http://telektrans.hu/editor_up/vufuzas.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/tumirobajavineze.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8cc02044---vezagipo.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/doworo.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/ludatidegewava.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/413844568613db961e7bf2.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/viduwejewi.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/50276953744.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tulufeleliroziviwepujowo.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/silafulomet.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/f58cbaa716217304c30f417e05c4091a/fowup.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/fidipune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=qr+scanner+creatorPDF 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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 18680 bytes
SHA-256: 846cda72b30cde52220ab2dd9d3cdeddf1a578e419c1edcf55c5dd22c0fe4aac
font_01_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 10144 bytes
SHA-256: 859a2366d5c4dbb5961a17e0672cdb15a4abcf84d246c0521b72b86aa3fa946a
font_02_sfnt_off000118d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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