Malicious PDF — malware analysis report

Static analysis result for SHA-256 8115de5815eabf57…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1cf0614c793114d6630ae783c2d40b6 SHA-1: df1329567ee94d2b6bfdd7aa522d57b0acab2b96 SHA-256: 8115de5815eabf57b99c81d393dbd11da94179c356e9418c6bf980aeeac2d836
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vico-domrep.com/ckfinder/userfiles/files/sevop.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9af82646e5978a403ff026c39a306a8f/63199541905.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/71608882405.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/04c87dd8701d5207c16ef1c3ff327d19/kapakavodupugigimivora.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3nm94en7956ln4vrnggr96ffqj/setevozivewukafu.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/nojojeriporumiv.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/gezejapijomolak.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/8402736050.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/091ce19cd1dd9b820f3db69af6211520/jokepofetupe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899920a35f5---pokebaral.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c24e159c5---kigagasalalex.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a12920cc6f33b900267ee9ef131c3e4e/93307092804.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/puloborekorikabezasapub.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/63470370615.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/58326199515.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/77c34ec955f32009ed837ff2b16139e6/98433038258.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210828_184349.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/wuvanewokurupekozaje.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/76302973787.pdfIn PDF document text
    • https://adikketiga.com/contents/files/xeguk.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609049905f0f0---farevodelefogoma.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/ketesexugimapuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=proposal+usaha+donat+kentang+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/177a4ab266029c8e15db92fdae561c81/muxolatibiwujufifetabi.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_off0000dd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD11 17336 bytes
SHA-256: e01fa99ce4916148417646041b36c2e022cd4e07c5fc4aa61b6f3b0f08a922e6
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10880 bytes
SHA-256: 757d7d3f72c35880c0ec5ce3e741c770ea1c0e42451bd229e8cc34fd5809c99a
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1