Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed33d729f04d5f4f…

MALICIOUS

PDF

84.5 KB Created: 2021-08-19 07:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bea84ba03186057502da22fcc188e39c SHA-1: 1543be945036e05cf91b556e17d6edfba3623b67 SHA-256: ed33d729f04d5f4f921a764528415d24c8bff60512eca7660d06e96a7ffaaace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as a link farm pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ziva-muzika.cz/files/file/82571725211.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/80858972e6caa33d074535cce23a34bf/91927369872.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609384417ec8f---zudosadulaxobonawe.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865679b35fc---6427656070.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/zikurajudubepubebilame.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f691823a11---20387842412.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/pudesopawaf.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/8036248246.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/jukolujeraniv.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/db93f51119e064535238690428f46b56/79646735785.pdfIn PDF document text
    • https://edgecs.com/documents/kipufojokivegixetivapiguz.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/cb9c18346f7e90d5b4c7237562521a39/10086763470.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084b5c876e2a---50499057085.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/suompdfkjqumgcm8b4q6e3p2fp/ruxat.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/hbijmng7e8ba8hiq3etem45598/wawonuda.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/lakulesonikogoxumi.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/gilefaw.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d77fe49dfdcb7b3041806a0bb12e0f61/navuzel.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/87304533507.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/wumizu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/catf825ifojbe15vf1sqlnq3b4/43476563197.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed4irn5lprum2n2jc1f7apt44t/sudofibasuze.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/31392107338.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/xotisifusima.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/74426249000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+are+the+duties+of+a+clinical+research+associatePDF 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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 16336 bytes
SHA-256: 5af8ce4d0e96f241a362e8e52466e6b4c9cf979bf850b2a084e5d3cf7594e306
font_01_sfnt_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 10664 bytes
SHA-256: 7c4cc3a3ceeb96c2ac90073e30d162616254dc6c881e90eaf7b504e4a3c680e2
font_02_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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