Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24de5c19eb6a77b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-10 14:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cd0def5c4190b9cd4c5037d19258ddbb SHA-1: 3b6f6e76acfd31b68b2b88974a0c0d051fe6ac6c SHA-256: f24de5c19eb6a77b9d6a98583d01a8fe24d38f07c8bb7061e4369e6a9da813da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.binghan.my/userfiles/file/vosideru.pdf In PDF document text
    • http://96stone.ru/userfiles/file/sonufuregowibetikibo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xopawejo.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/38547234616.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1f54d9a2ff629ac23285a6a91ff761b0/94023080174.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/33983087491.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864a9e1e04---95877977315.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd1be60c5---40289260055.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vosapan.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/efd8b1675331d426be2c98e5522f7e0e/xivisegatuje.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/vowuluf.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/d38879ea393d3cef8b2c9e05d5d857dc/936796488.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa31a0212e---76702014105.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/jugipo.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/rolubiburubuviromebalon.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///zalivov.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/poxudujirupuroxosejozuse.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nepql1flst6bn6h9p9qf0oiau9/66510847188.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/9036196041.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/zupamegolugumowuwifo.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/xosodulexuzoj.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/52697921501.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/51280315479.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/93101620492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lidl+plus+card+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_off0000b3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A3 10420 bytes
SHA-256: ecf6f1247b2a571b577644d5057ba80b78217ac1d2f06bd164ca0b7545760213
font_01_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 14408 bytes
SHA-256: 7baec860c0de52a9716da5f68042fb6a1faa22833eb80deb96aed5a04e0d57a5
font_02_sfnt_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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