Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee41f869e81a017…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 06:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cba3706ff0d96a33317fc090f91f4420 SHA-1: 069a3379b6bba08834147f825900d7d50c9eed87 SHA-256: 1ee41f869e81a017fa0fd859c1d3a0a3bb02a6e416031a68a5cd7542f396d845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms, designed to redirect users to other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://matao.ro/app/webroot/files/userfiles/files/6699739438.pdf In PDF document text
    • http://fitviewer.com/files/file/pewewuderadamawenoru.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/xutajuba.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0ae57bbac---newimigunuxegusotite.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/mukoxanonebadigaxis.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210917103253.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/41943397966.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/95675471872.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390fefbd903---9085242363.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/u4bn8h4rrurv865du5oa9642p6/64938136456.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/vapumabubuzexevo.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/11290150787.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/pupibazusigiweluwazodes.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/sizaripavasog.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/18463171725.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tiperuwogudogu.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/tumijoxanugame.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/48186622677.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/65380280834.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/91416737556.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/ponavukumuzogufovuzeriv.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6d56bcac8e057ff3d0043dd38d485046/xofuvetidafiriteg.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/kaleduwaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=money+tap+apkPDF 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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 10036 bytes
SHA-256: bb1f564c76db12fb5113b245d7608e8e44d25fb8715245ab735c3d88ea9638b0
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 18720 bytes
SHA-256: 1852a053df282eba50a863f02149cd90d5554f5d9eda273366b8a1334eea5a71

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