Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9c1c4aba2cdc9d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 22:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a83e54cb77c2bf32ccfeb4c68e792e2e SHA-1: 4ada16c98e2dba37a1ffddf36a0e70e4cbc8e148 SHA-256: 9a9c1c4aba2cdc9da9e97c8fedc7f6999bd188742e36ee2ab1467a6eecc1d19b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with several URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d1296cfe627ed2c6dc1609458bd82e48/fawoj.pdf In PDF document text
    • http://bowlingkillers.com/imgdb/files/73705487584.pdfIn PDF document text
    • https://panama4d.com/contents//files/nobisuzir.pdfIn PDF document text
    • http://learningkey.org/userfiles/26354154244.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fafobinesunadejupivedoti.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/50337460780.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/rozogowazumudabomodivi.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/970834866.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/wiwexozewipejipawonow.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795dd872bd5---20085868284.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/k6c64bui0kma1h26hoaor4poph/samizupulekuziwajeninanis.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/rezekawotexutijoxagarane.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/67127062519.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/fafenokivoxapirelupado.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/48219176960.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/ruverodulu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/03d8b9a284c59b474df44f10238872b5/tepokemedizejibevare.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/31462317248.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/68091174201.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/31d9e6cc5b24a7d6146ebf6ed999b475/88844348975.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xifevatawefusoburokuriji.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1df2b4ec2---53546450443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=queer+phenomenology+sara+ahmed+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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 18584 bytes
SHA-256: f557e44fda67cc7baf8e0a1ae805921c8a7d1ced71f68e3097592303412761fb
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA6 11028 bytes
SHA-256: a534286fe01536810e433f5b1b39b58f0e5e5e915cafeffce792026d304bc625

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