Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae5cbd0c8f234af…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 13:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 082e5f3a237ec4daf3200c106cf465f2 SHA-1: 37892d7c76a7c61b8b2d384862eff87cb476165b SHA-256: eae5cbd0c8f234af7a47872a66cbcba5a02035bfa7202753c05160eb641be199
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bibliothequedesarts.ch/ckfinder/userfiles/files/poraj.pdf In PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5787770fb08496944294b2fc47e77126/wesojobirilemupo.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/silosakiro.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07211d653---kaganisir.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65cdceae5---sitaligemik.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/gujaluborif.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/badum.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/5449020546.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/3052654877.pdfIn PDF document text
    • https://stormester.no/files/file/xifimunokiliresizes.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dsvthgrlvqai8acd75aukcd5ru/jebudabebijig.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160919307e83fe---rejevinonufobegowamiduwi.pdfIn PDF document text
    • http://svx.su/ffile/file/76266110907.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/buviremufikexenakiba.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vuxufuxesulo.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/vebinukizebeposutupo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210605132254.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c239aabaa---pabigetopusoxeduzikanaza.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/19fad07fe9bbdd63126a34661c716408/kibizogajok.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/25069183921.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16244151968265.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/13864229447.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/47280908850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=le+monde+de+narnia+tome+4+pdfPDF 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_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 20280 bytes
SHA-256: 78486ab5e2068a0b888a64b22e9ceae0dd2169fc414d2f4d8461e645a6c9d175
font_01_sfnt_off0001106c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 10480 bytes
SHA-256: 09a6be7e1bd5f616b4d3087fc584e9f63723d44a38933522f7112e013c22fd58

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