Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6d91a9935b8a7b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-09 01:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87225925ecc0fd196b6963bdacf251c4 SHA-1: 0bb254776934bd5ee425145aea3a85a40e0c8e89 SHA-256: ca6d91a9935b8a7bd3ff0c083513b2bd75838807c7805b916d2a0f4eaf2e5a5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=tiger+boxing+movie+watch+online PDF link annotation
    • https://resulgame.com/calisma2/files/uploads/notesalitojedovu.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/vukexipazodogaz.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/28934333573.pdfIn PDF document text
    • https://atl-50.com/files/file/25526913244.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zuvotowenibadatazimini.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131babb2e534---6288095979.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/fibasi.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/babuliviwurewexo.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xufijonime.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366133b351f---pomomedazisije.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2p03qbieqoj1g5g872pa2j9337/22487714952.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367dd45d019---96605237605.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/53855139494.pdfIn PDF document text
    • http://greenld.com/userfiles/sinerinilelewexulomew.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132faef7a18b---kozigakanazelupiv.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/23270829940.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/97961358471.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/85497364453.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/jedogezaxowone.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/78679441496.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/70178996424.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/28538869209.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_off0000b94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94A 10864 bytes
SHA-256: cc8f234f9370da0b0f41465f4a9463acc5c509ca64bd497591ff9531f432e708
font_01_sfnt_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 17036 bytes
SHA-256: fca62d19748bc6fa59f52e22bf279ff77867976123e44bc2cb7e250977283e1c
font_02_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1