Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b655f365e22ee4…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 19:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ccbc3caed8414c9a2bdf73d637609d2 SHA-1: 829edd7df239ddfc25092102c25c11392ea7b5a8 SHA-256: c0b655f365e22ee48947e88ea90d3c5f705c98dfc60752efeb4aa338b7a26419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986798162---71072193162.pdf In PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077090a6de74---70529560507.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/zibojawumado.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad57eb1cc8---kawuvamevamuluwuvari.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c929474e---78949568047.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607588f03936b---fifebumivexadusivud.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/lebalanu.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xutusop.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/35661378861.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc46fddb078---43113060971.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/murugexesodebazoxoxigopaz.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160802b938be92---2664852515.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/22895601419.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/68605337977.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092415f53c1e---67112422724.pdfIn PDF document text
    • https://x-software.cz/data/file/11381189029.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4b5036951---61091540617.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/tedobere.pdfIn PDF document text
    • http://riph.pl/userfiles/file/54906503456.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608747f0bef37---soborezilunuv.pdfIn PDF document text
    • https://clinicscrm.com/img/files/nefosidudakiwixijizuz.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/9031470323.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f8caf6a31f---62812042381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=apl+ration+card+cg+pdf+downloadPDF 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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 10564 bytes
SHA-256: 0a0fc8ed9dd8d0eb0881d3b86dc54c6b9b9e2c8cbcae8b085b7564338286914b
font_01_sfnt_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 16192 bytes
SHA-256: 1ebd43a9cbc0e3d60472edf2e59a0e63805efbb03d91ac1b24e4e81c57220693

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