Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64a351d90dcb839…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 15:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95284e4d0dd642dadd12a95dd92e476d SHA-1: c0fc4248c7dd279f4db21709b021e86fac81b123 SHA-256: a64a351d90dcb839ee8d1e4e4d7c84bc0644001d41895aee3eb57cb4ddc7d1ae
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2de4e001---zujabu.pdf In PDF document text
    • http://fashioneducation.ru/userfiles/file/poxixolikebupi.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/23003695274.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec3d13163---40945992988.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f771853b5---nibosikutoxefeva.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/67590297254.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/wuseremesiguru.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/rexaba.pdfIn PDF document text
    • https://kopari.hu/files/file/suxeginarirewuma.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c32afeabd1---jubugokabifazuvoti.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e9a6e0c8bc4c0a1ed3e366bb6fd363d8/64211062469.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/bcccf341bce2a4f8908a0cf83c2fa009/57095966847.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08c536b1b---fezagidop.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605a01fa34---98904348337.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/1aff6c486159f22f03e11cfc72968ae9/22059801688.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8edcc996c0---91563337692.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc01ccbf646---wugidupikorefut.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/11197618444.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/rokuwu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fvaunb87enj9bu0jtdgq0dtu1r/63755065895.pdfIn PDF document text
    • http://benetalent.com/upload/files/vagijonefejasotagowuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=carbon+and+its+compounds+class+12PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/tijaki.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_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 10984 bytes
SHA-256: 9e19543c6973907881d3ce67d635e1e65c9f2390605e266184872be5557549bd
font_01_sfnt_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 17636 bytes
SHA-256: c180e3d8edcd51c32afe430ead987cb2333101155e5b7bf41c1d80cac2bd6936
font_02_sfnt_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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