Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c94925e20331ead…

MALICIOUS

PDF

105.9 KB Created: 2021-08-12 21:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e28b556d6a816b579f7b01d1804c483 SHA-1: 05ab50972c64aea93a3e507f751bf434a6f8a71a SHA-256: 2c94925e20331eadb45b7fa502654582ae8b4b9f2ac18a0d9a40a9e19cfc63a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=trigonometric+applications+worksheet+answers+pdf PDF link annotation
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mm31jfpe2g968dbqjq4vfk1n9n/31804139880.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/98234937331.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/60703802737.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/bidufimeva.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/kiu73r1jqjt9vb5plsv5o2thhd/rubolavexap.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a203508a0c2---mitubemanugijaxevufo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/5146791605.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f315e9d7f1---82785603618.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/jofubagajonikupixopibet.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rpsnp7n491lr73b9o4k2nlur35/tegilabulegijufinuwumapo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607355ca776b9---gonajezuforukig.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/selavajipinawusaji.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/11769434998.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb228e335d2---67565913562.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2611633f8d---pisixevufeniwopulopewusiv.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/63146065782.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072b033889bd---jorug.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/36531410436.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a5ba59b5---fesutukuparixelebokof.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba41a66992e---1637566637.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/5506542872.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zexafexobigawozeg.pdfIn PDF document text
    • https://network-italia.com/file/27318036425.pdfIn PDF document text
    • 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_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C91 11208 bytes
SHA-256: ce472f4e66aec61bb12a2d307dd534411193534b8ac1f8e47147a5a80017b10d
font_02_sfnt_off00016676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16676 19816 bytes
SHA-256: a69b86a05d124dd7d3af41c725487cabc52f2ff414d9b62b20c7a891e46e0c2e

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