Malicious PDF — malware analysis report

Static analysis result for SHA-256 93db84b7bbe834a2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 01:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06a01a666f4a734f5f2bea770aa23d94 SHA-1: 8c2f523e92b998d4a61d1d4855bc945813fdb388 SHA-256: 93db84b7bbe834a25b1f4df6caca4f7a343234c2a77a5e628b84f2423aea8486
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://recit-de-vie.fr/userfiles/file/rujoxabike.pdf In PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e492b85bb6---vebewede.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/febaton.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/73172791133.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/kedevidudipu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2cc7461f57d36fe9590c90bf0b369e71/2341169739.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/12262149641.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc108272a2---rarurawixenejowex.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/bewudotupoge.pdfIn PDF document text
    • http://onelove.cz/file/fosefukodileduvi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cc996f95---67989151611.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/15831505154.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zutemolulevelukafekes.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/12204526188.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/15349613663.pdfIn PDF document text
    • http://grupophi.es/uploads/files/76099620029.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/43936547921.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/nepikapinizuboletigixa.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/59487492693.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/50191949181.pdfIn PDF document text
    • https://hobbypet.cz/files/file/16609959654.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/627299179614029da0803c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=channel+10+live+streamPDF 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_off0000b07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07B 10524 bytes
SHA-256: ba3e99d3e2c2dceb5769dea63161e3517b1abaa1eb3047430a97c6048712e51b
font_01_sfnt_off0000c859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 15984 bytes
SHA-256: 669e85bf4f6e92ee5d1fb3e4967934fa029164ec5b28440ac73d35b35154fc0f