Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5f410e750567d3…

MALICIOUS

PDF

85.8 KB Created: 2021-07-30 13:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0598b68c443221866dbe147ce7daf847 SHA-1: d0be531fb4bf72b94a504d6c370a1661d2050e2d SHA-256: ed5f410e750567d3cea268ab9f81a2087c392e937b17593144da70fc10d7b9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with multiple URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is unreadable, and no scripts were extracted, but the presence of numerous suspicious links indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ba11a8d1---vodinozevamonugefulujigok.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a77ddfcffe9---20295295488.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/52003560910.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k8cuj4ilgogi4mibojf9ecjouc/gugufalosidisofafevupopex.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb5061050---85816303939.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/88169543405.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b752ded36---92487430746.pdfIn PDF document text
    • http://lucann.com/Upload/file/13255013059.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/72496373216.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/41d8297869ff5441ff159b3ca3c6db79/buxuriwojodi.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/31875449374.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/10895582765.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/14142130047.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/85932549900.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/somelaromi.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/pebubase.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad999df4a---gasaturenagivunanenutog.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/db343ebee64faa2e4c02ba5da86ccba9/8368854717.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/sujewutunepitarowit.pdfIn PDF document text
    • http://teraval.cz/res/file/50527452738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=are+flying+lanterns+legal+in+canadaPDF 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_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 17048 bytes
SHA-256: 6645501f57bfb3181cc196485e938fd87210385f57a7d5270aa75a3c5b8eee83
font_01_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 10628 bytes
SHA-256: 4f33cd548f023fc126ac3d27108846b798aaf70b9d76d2d0ed138ceb44645d02
font_02_sfnt_off000131a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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