Malicious PDF — malware analysis report

Static analysis result for SHA-256 866d6d2899c4223a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-06 09:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c3e21ddb136fd20c63168b68e3b43d40 SHA-1: c384d35fb03342ad3c82abcc938c41b40719f254 SHA-256: 866d6d2899c4223a1db15691083bf02592cf518b4a033e217a8ec5df3041f452
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 0.9840

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://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4ancgs0d1roffvbq9ktbpf5fr3/tufudatapijiz.pdf In PDF document text
    • http://fvhs1970.com/clients/876770/File/jisutok.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cda174d68---12660526976.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd25b68e1---86856840491.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16072d099669ce---zogewadipiminabevog.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zeruwijewuzugemavomepugim.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/43513399636.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/poliliru.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/zividin.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/kawajolovugajug.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100297a585c5---wevuxufelalemuwanuso.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/54740905084.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ec0afe7d6557c1b4ed54ee7140fe652/guwimopalewotanota.pdfIn PDF document text
    • https://wagaskar.com/media/wejejisapotezaloju.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f759fdf8828e41c88ec57680f369fd0e/pojopem.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/zimojixowijane.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/69498453824.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc0b67d46---nitatolox.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094c289ae38f---6145807798.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zatadafazega.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/xinijolopulado.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/35029322892.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/rajolusete.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/08d604efb00da20fcef77c8f541f7e99/6120959111.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/52074139442.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102db007de69---jerogosujufewunimuvujeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=essay+on+current+affairs+of+pakistan+2019+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_off0000bfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 11320 bytes
SHA-256: 9d55bbb506a814d43feb1f31d973b888e62cb9004e25e9550287a7cc48557990
font_01_sfnt_off0000da9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9A 15748 bytes
SHA-256: cb93e99bb0d828044e85d2879c6f71ea5297b04b5b899e1de3bef7a69450f44b
font_02_sfnt_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1