Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1e61a50f3bc4f3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-21 01:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 440cdf77f2085dc5fff118927641c17c SHA-1: 7d76714989f714cab9576edcc37adb4119753db5 SHA-256: 4c1e61a50f3bc4f39d1e260cca6c58e89588552488b0e68c7384dfc79a360325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection scheme to host malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://dientrotiendathc.com/media/ftp/file/6580045325.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431b4452194---15076164070.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/vedumevojivewilofodizup.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148c60058018---fakobipidan.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/worej.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/fapepixakujogenabobi.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/91506870304.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/62914136199.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/22239705552.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/godesajuvesotomob.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/wibisesesalobazomofos.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/jezadafaxananedekidinod.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e5f573262785d285ef9bc6b1adf3fa1d/jewipumevi.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/gobogekinutena.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/kukavikoziruzireterema.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/watiwej.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/wotuninetepo.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/71242138626.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/72131977679.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ec0a0863---sazutasiridajezo.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/90419697344.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/7508084000.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/2986826271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+duplex+play+on+firestickPDF 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_off0000cdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD3 18088 bytes
SHA-256: aa512a3270f8d491e8e48e626182d4bc3431dafaabfe50365250af83c7858024
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 11096 bytes
SHA-256: e0d0f94ff3b6ce347c18a9efcf038d610702dc6315a6b54eaa334a9db72d8dca
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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