Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd567ec4b42fbd3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 03:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4aed1a29d6c762a44c6a65cf6a50ee25 SHA-1: 736cda6f0335ca4c017a15c3f99f77d2c1717f4a SHA-256: fbd567ec4b42fbd38a15aec771489262372407ea5d16ded581a5473455b6ad5d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using algorithmically generated URLs and compromised content management system uploads to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://straps.by/ckfinder/userfiles/files/pivibezaladoz.pdf In PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/47724158860.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/45982809604.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/71463368212.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecacadc97---6280616353.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210803_7D2DDCC82B497E0A.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/52304809238.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/mepedoxebave.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/megitike.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/dufemakibemoredas.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/desixiburu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810ea077ac9---11974616774.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8e954e8af25bb9ff4b46f5e5a99bce0e/45877374879.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sh93v1i5u3p6e8nov2eam938b7/muzegewidefusonidabadul.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/m1ukpu98gha1339lk9adf18s02/59402796711.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/mofelelijonikefunolunez.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/47076810026.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074964fdc3ae---36165183557.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161262d2f9803f---kepufel.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/21203559912.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/mijamabumokafezo.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611656ee6fc9c---20935303772.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/14583185494.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608150ed206c7---wuxifajujusavuxagotuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=paragraph+writing+with+hints+worksheets+for+grade+3PDF 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_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 11080 bytes
SHA-256: ba5b75638e6a7bc3b97bc774592d86b6376634f80f863e6453d42ab7726e3655
font_02_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 16996 bytes
SHA-256: b11fe1f53bce0e7274f66a667a48e062f68ec1a55a0390675e12da655e016c8e

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