Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e594806823300b5…

MALICIOUS

PDF

87.4 KB Created: 2021-09-08 06:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96b1f640bcfb040d9117d9bacb350842 SHA-1: 2b92527c32e2aba00e1dac12805684c11613a9ea SHA-256: 0e594806823300b57f90de3629129f95b02bd27e59b8e40e5b6d84222f71112c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely involving a phishing lure or exploit to deliver a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, with the link farm serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/2iaaahihvgrkfj04lte0scln92/jabuba.pdf In PDF document text
    • http://dostavkaturov.ru/files/file/3694916056.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/dezowevoketivilor.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76a8b77b3---53047758754.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/fipefamodobolosewaj.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/pereromuzuregi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bokevofisojodajovisupeti.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160840d1aa5337---9915468464.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/82813394021.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076aeb32078e---76327376891.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/pekigobek.pdfIn PDF document text
    • http://industra.sk/userfiles/file/67256816484.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/47253687105.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/30551060668.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/65320997525.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d1c7678919b3ca66675dfa235b4162b/25411913601.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad709da21f3---kalesesutewurupovelolaxom.pdfIn PDF document text
    • https://cargobull.cz/res/file/relajam.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/97711042855.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/25493953915.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/40967247460.pdfIn PDF document text
    • http://saglikligencler.org/files/files/wononojitowupudina.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f70afe29af1---kijazasomufunex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=footnote+style+chicago+manualPDF 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_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 18564 bytes
SHA-256: 0a21b7139551bb9df3bcf767369a6c78dd8f04cbcf502d0cf8028a04259274bc
font_02_sfnt_off0001376d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376D 10768 bytes
SHA-256: 230c79bea68389504ea3489c8bad4b0a0f2e8a2fa3050f0417b7f1ab231a94e7

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