Malicious PDF — malware analysis report

Static analysis result for SHA-256 9751666dbe85177c…

MALICIOUS

PDF

97.3 KB Created: 2021-06-30 20:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b750b6b03d3907a285cc1bdca3d91f5 SHA-1: 72acaf6fb11330d3f4c51c23ba404fb2cea5de26 SHA-256: 9751666dbe85177c82e2cc10cbc7572902ad56b08b182dfbef5b46dec8ee0f43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=song+my+hope+is+built PDF link annotation
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/c7c66e120298540c2ead63b3157a3a46/58077048373.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2c1d224c00ff4cc135897521ca6894d6/kijefalerufu.pdfIn PDF document text
    • http://hkalc.com/userfiles/65532085665.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/470eac57c3571fd6cbd7de4dfb1fc8b4/pusazuvelutakatogasif.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2ij10cuk86j2h0iqi6i2cl2rv7/pesiwijixuvejufopuximisef.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/60344202434.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f38c0ff72---85221498557.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/345113685.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4f751ef5887fce06a68f4804acd8efd6/niwedovef.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/19032088618.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdc81836b---redenesojojavakiziwuze.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5167v1462grsiej872n0uiubbu/zipakidixisi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/90039e115609acb2006f8bc7c8b457e7/xukimaxajosogitaxalifesok.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcd22bacac---98106631821.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/551969926c7e02c5f4e1a7c7000abdd7/fukonigibepowiwelu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/acf5b2ed09a0e7c93c1884d36f6e2973/zabifajemegari.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/30c9ulh4gntl437ra2rqnegoq6/64223099421.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5f51689b741043f74af48b64c3478fe1/medesogag.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/63839871208.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086c46c116cb---funas.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7c59e99642e6e8d5474ebd0d7ce5a721/getirasutamobagige.pdfIn PDF document text
    • http://boursemoi.com/userfiles/file/kovavixawuvogixobuzofojiz.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/u2ni7f6k6cqbmvu2ak6sd5fas9/kubowu.pdfIn PDF document text
    • 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_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 10864 bytes
SHA-256: aa70a29cdde2a3b44294be67efe7a7d546a9011cc1d0eff0c92a6c7ce2b0c908
font_01_sfnt_off00013262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A74 17416 bytes
SHA-256: a0dcbf80641fc0bd1bfc91aacb4c56cee3a3d866c825c5d74e560be72af2452e

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