Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45cef34cfe80e93…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 21:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1cb5dd22060669a6f4d2ad1f6162817d SHA-1: 70d62777fbe57a83e90585491ab684cb34bd8684 SHA-256: c45cef34cfe80e93096397c7160f13cc308721735b4d909bd50ff25b0a21178b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external links, including one pointing to a compromised WordPress upload directory, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://location-venise.com/italie_documents/files/82756790060.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/xazovizirunekukanonul.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9de9c8f1---54013354328.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/dituv.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/debesobefekoxesav.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/witosotanat.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/69172295671.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/63850238085.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/9974138195.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/tuforemumipipo.pdfIn PDF document text
    • http://cssh.es/img/file/texipiwigurubexed.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/betemegobabajofi.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130b28278fd2---27679048672.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/1877170113.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/nuvedavenonaz.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/73c14d759a085a6422c724a53946f4e4/jasetivumapavawixaxez.pdfIn PDF document text
    • http://prograsifkalip.com/files/talipawulek.pdfIn PDF document text
    • http://julianina.dk/upload/file/xifebupemafesigifujosa.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/sedeg.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/5440998916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gold+price+live+app+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_off0000ecdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 10432 bytes
SHA-256: 8d62813823cfb97b6d1dafc231fda0c274bc175690a685f373c2cff554a80275
font_02_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 17284 bytes
SHA-256: 99f145eae668062a4c1dc6389249ea9d189408b01534777b5592c38d18485b14