Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f03d43eda3b60e8…

MALICIOUS

PDF

91.0 KB Created: 2021-08-13 17:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4bc574f7a407899566a2e48b9620c5bf SHA-1: 0ee22113fb49fc6f1df4582b626366ed8fc8f19a SHA-256: 4f03d43eda3b60e8d66c19e049f46e60bb6acfbdc7da9d7074a5d7691c5a575d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608353d215e5a---15828245352.pdf In PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/diwasululij.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/97689007419.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/41968118583.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/80103829447.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210726_D4108E75230B154F.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/20769678102.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vemakipo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e8c459fc---69421452779.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a5b67cf9---zuzivigegelonosarid.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/rovakavobegopuguf.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16070b834e9751---90489626139.pdfIn PDF document text
    • http://sdds.be/userfiles/file/zibolobogo.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/xifalujonupiwawik.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/tedexedamijiraluwer.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s5brkcagh5ojm4nmctv7s3kgrk/88964692526.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/tabagevulujozafonoxuvusor.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/36942372742.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/riduvopamatenevevuwiw.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f263f0440---kegutuzizozakepamajop.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/54159479851.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0617c79ac8---63707144992.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/zotosenusilolibidamusaza.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d509f8d34b---lozug.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nafekizonuf.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/danaveserireluzesim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=asrock+g41m+vs3+r2+0+drivers+windows+7PDF 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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 23340 bytes
SHA-256: b42567b00e76de0d4eb413c02f8e371d680056480a6eb963c5ca1a81c7503d1d
font_01_sfnt_off00012a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001425b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 11228 bytes
SHA-256: 97a692dfffc621b7897f8ed3bd538b96d29fccee437021619ccfd843139ff2ea

Open this report in the interactive analyzer, or submit your own file for analysis.