Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0a728a4ece737a…

MALICIOUS

PDF

91.2 KB Created: 2021-09-06 21:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f70975d466cd030395d78b8cf018c142 SHA-1: 5aa2f8ccaceb62eab8d7037710f82ead08530a73 SHA-256: fe0a728a4ece737a5091c27e90c4992483ec359aeed3e2374c6440e56ec720ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm designed to leverage compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8cd0c0544---zojenovopej.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5ntl45u502c9roc2f1qq8p4n53/bitasukajibopege.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/20e00bb717cf3adf241d830e75770e94/wozum.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/wafudaro.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f43eba3bb---78376700377.pdfIn PDF document text
    • http://aven.su/userfiles/file/43912152197.pdfIn PDF document text
    • http://boxethai38.com/upload/file/kawotisefepavotagitumos.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/67533868275.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/nusozevokofisogi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a5nkck8iiu05rq9v3h5vsqlope/xosojuwuwiwirezanuv.pdfIn PDF document text
    • https://aedwea.com/upload/foto/widirupulamuseve.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/bufosaperab.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489579c0f6---jupovexemunudeteva.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/17390393920.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/67858061551.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/zuwigiw.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-8/file/nudatogelawefotavixiwi.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/mapusufixobikotarolup.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/nabataloju.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-20-05-44-36-25.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/164a479598cfc1b936c340336173a597/1875798660.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/5dec6e5a5fb699e98266df0a5c8adb3a/11135834824.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/96652484190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anatomy+of+digestive+system+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_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001186b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186B 17648 bytes
SHA-256: 69ed887b7bacbb6b31ecc6fac7ebb7e75393bc66a8a9bf1671050eb408b1547c
font_02_sfnt_off0001468a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1468A 10856 bytes
SHA-256: 370539c81eacb563883cc65c95dab100b976610be34b04be921c9d7d0d86bed6

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