Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f537a9d692984e5…

MALICIOUS

PDF

109.6 KB Created: 2021-09-03 22:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad08998e07cfec3a26579080b2c0e43b SHA-1: 921cb6c8f3e65f6684d773b701aa725654d3136e SHA-256: 2f537a9d692984e539a513af3680cbb7fe073e639bd0ae1f5f24c8a435f9d595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d9e94c258992a6a5cd1f5e517ac3c772/17593344569.pdf In PDF document text
    • http://teakdeck.pl/files/file/befojuk.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/7834078515.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/20062737760.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/mafenelurujutajo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ppljrt993flae2ur9uv85mke0c/xabop.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b82c336c975---xufuwiwelilitola.pdfIn PDF document text
    • https://ckmandarin.com/uploads/80824762398.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/dafelibewujomerajesana.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16129a75a03cd3---talovozalutuwewixodutilav.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/nagufenewedulalotinu.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zotoxevitegavuw.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/22918162585.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebf0c7e3dc---42672908989.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ec661be9b5902c883e2a8acb7d7bfa1/jurerapobazerep.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/turajovadumasil.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e13caa078f349edc7490fc370394a688/54056761368.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/govirazelu.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/xokas.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9ce24257427af064d0f29d633edbae42/50526389446.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89041461912.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/20050849146.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74fbbed88---18301888090.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/89405565243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=business+corporations+act+canada+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_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 10720 bytes
SHA-256: 51662e965c2ca27d1b6531f95b806f6f2e98e208646d84a3fa0c7084fc2e7270
font_01_sfnt_off00015fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA4 18668 bytes
SHA-256: 5f99eec5c2f191f51484cbb49d64a593d68ce91927451cbbaaef161d2fd0fc49
font_02_sfnt_off00019055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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