Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce5bdebeed0c7a3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 22:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77faa5863812e1f31b5b763ac9958f60 SHA-1: b55237bd742781069415788e84993cfd5b19010d SHA-256: 5ce5bdebeed0c7a3bd5a391c99efcab26ab7a2a906c845fc1e070e223d4cab2e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common technique to evade gateway scanning. Numerous URLs were extracted, many pointing to compromised CMS upload directories or disposable hosting, suggesting a distribution infrastructure for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ty-int.com/files/files/fasigepetokelaker.pdf In PDF document text
    • http://pulsarvn.com/media/ftp/file/supixewubinageduduxinibis.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102b23046194---62978764951.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e54de141f8---lijej.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/wamibekubi.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/acf0d706c73a1bb617ee07bb95eaacc1/65296446711.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210810195417.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2ikosfvdstkd8ak2sniq8q5hg0/66069823850.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/1912175311.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/4944315385.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4e7dd35c---76857450194.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/9151464761.pdfIn PDF document text
    • https://aspirans.com/files/file/vudoweropufifan.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/vufaduronuxuwusasesipi.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vp7qr1ghcrqeuqnh3f1b32hbf0/xasitebifawe.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/50m829tn87u4pmu3vd102o8n65/13229814637.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612a9fb65e43a---89751015865.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/66171147706.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c33d4c8e---32195238686.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vibarirexu.pdfIn PDF document text
    • https://promise-land.com/upload/file/gaxukinaxusidonodibobo.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/981196209.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f9301f4a901e79e0b4f6c8605f9f7655/59042141337.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gopapenijepujagagabedaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=convertir+un+documento+de+pdf+a+jpg+en+lineaPDF 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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 11124 bytes
SHA-256: 19c40485fc8354fcef4b0866822c8b56c77a01e08254c923d4e2a733a37203e4
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 18820 bytes
SHA-256: fac9cc6360f718799bf142b74a2424709c578fb9df0c5edad3a5f5381f1478ac