Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f3a0f0932d7ac2…

MALICIOUS

PDF

81.2 KB Created: 2021-07-05 06:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2469d97904632eebff775d7a2afa36e SHA-1: 5c63ffd8676b27577215545ed46762f60bf2393a SHA-256: 30f3a0f0932d7ac2eb6bb28a3c24782632e1d9266157afe9f916718e4068105a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to these external links, which likely serve as a distribution point for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795e46df0d3---jesuloz.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3014ba9f27---vezonawipuj.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b47139176---jinakepajunuranib.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/38987461660.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/aa6873867d423afb1ed8133d6ef38f20/tukivafevadebog.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a56ac8c157c---zemev.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa514554147---jawiwemasunosi.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/72257058451.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/nejesuzudasifamixa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/av8du1e0h3aveocaa4kora7onv/50548256242.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/63374760563.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087735539e8a---zabuv.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98db3c2cd---sularakobupudezuxemevipok.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/44558226705.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d41bfa5828c---fumekupujasujuferun.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/bipujurijanowotumod.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5958fd41f1ff31890b848f22812c0c01/sakotisixof.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/93723343499.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/lasuruw.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f8671017568f68273bcd1cba5343d466/duweranimawobenefelufipi.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/bamawuzolevolapo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb7925d3b---xunufadujezogofelufatana.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/mifewipimixuditigen.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/funawurebuxumizategarer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=office+for+the+independent+adjudicatorPDF 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 10756 bytes
SHA-256: 1d9f2b070c8eef4a1bb58fc68703c9f3f37559e8ec207dacc291ec3061a054ef
font_02_sfnt_off00010d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 16384 bytes
SHA-256: d7f195028e1d69f2642699fa25a5b0227e93ba79d99f3bc02da946d21052eede

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