Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf750c27df730a8…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 10:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: def104f26d8430a372b950c67103b015 SHA-1: bbe87e907300fe2d13a2ad0c6fbf9cb24a668e07 SHA-256: 4cf750c27df730a8b8a6c1b2723ae97baf2cf4879e4323579373ac007c065357
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=old+apps+apk PDF link annotation
    • http://hotelborgodeipoeti.com/userfiles/files/5014776017.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/vupilizufuvidadenide.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/22089233781.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/14511590391.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/77276171870.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/45652617421.pdfIn PDF document text
    • http://wami.cc/data/files/9861900535.pdfIn PDF document text
    • https://andana.us/files/files/texukijazazeved.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/81387057354.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/wojalizowusajamadojovelog.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62338778168.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/46756842197.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/31865560311.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/45565032024.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/49145913868.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1315ec201---10337202422.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148cb0b77e75---wusojedirawa.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/87998608323.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/nupaxibitolojugidilidufa.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e1a82679---bipatewemexumusug.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/37148562206.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210909082734.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/18351919126.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zujelipedikifoniwisuzik.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/82264611056.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jugowupukaduxop.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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 17400 bytes
SHA-256: 7b7fa52011d78f65aa78db9c3734e48beb774288a287bfc9f3087a00078cafc3
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 9856 bytes
SHA-256: ea6bbd7626d411fa60bee81ce72f82e541efd2f462fedd9ad16e108d6c3fc876
font_02_sfnt_off000108cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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