Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bd7249c4c973c9…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 18:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 83488f32e419fd6b154ebc23e24df091 SHA-1: dd095fb6f7e5491945506c3b58ddbbfc3f3f66d7 SHA-256: 81bd7249c4c973c9c7124b55d3d86c6d4811f5c862fa5878dcb3c816523aa6d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://mobilieroccasion.fr/uploads/file/48626256990.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d380b9e110d---jewoxudarusujoxofovobibi.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/25148263841.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cbf7360441fc0b08940495385c7461a7/21962317943.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/7381609176.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/22598857767.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/82530634528.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/virip.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99cdcddec316f22d4b893ec4a70bb91c/kowapojutakidipus.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gibesivuzajed.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vatagenejepidubepufip.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/tiwujevok.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/47mekosicra517cmr3fbdt4p0l/zururofiguxifiderenun.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/tazisijuwujejupabej.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mipizogurekeriwa.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/zazusonekilenatenefuzu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc71ef367e---watototaram.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/parokopobusutagafawu.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/87129769470.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87300a2e5f---80876353550.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/6179u37uiddje65084j5edfrk5/25326433854.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4377ea938---60823343318.pdfIn PDF document text
    • https://dalba.net/other_files/File/nakulejabuxewine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tkt+course+book+pdfPDF 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_off0000bd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD39 15496 bytes
SHA-256: 6fc8daba5efa6f230c225e83c03390c5d8ad2d54f9303606f3e2e12b1eb6f4e2
font_01_sfnt_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 10504 bytes
SHA-256: d84a43f2d3e50b7fc750ec94142355bec865ab1ab9dd3e4199b42d2c84cb45e7
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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