Malicious PDF — malware analysis report

Static analysis result for SHA-256 649730ced99a7190…

MALICIOUS

PDF

91.3 KB Created: 2021-08-12 20:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1ddbe62904f8940dd7478e8ea3bef62 SHA-1: b87d854557c7cb9cd5f759d6c5575bd06dc50be9 SHA-256: 649730ced99a719058c98e03fb26f628a946f27a5698295617dda56ef10faeb8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, constituting a malicious spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qlr0sb635qne6ir875a2m4vps3/bamagibiro.pdf In PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db932fb30ad8a6ee35d189c52dd052f9/razabofus.pdfIn PDF document text
    • http://myphamasia.net/upload/files/venoxu.pdfIn PDF document text
    • https://businesslife.com/content/file/sozigob.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/14489470694.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/80491149609.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/52930046602.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/xasesuji.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kaguzifi.pdfIn PDF document text
    • http://juentai.com/userfiles/files/21167855057.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/80d2e7ad042d034d80195da0f86c566c/2367255014.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20bc0ec87---sokojawopuzub.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd23ae2d345---67083333972.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4b49da94c---nokesurokezepun.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ce6d3e1daa68445174ae45195193519/dojovoxunizesetisokemanit.pdfIn PDF document text
    • https://2acontractor.it/images/file/rujaga.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098678f9cf1c---naxubibolububeduzumig.pdfIn PDF document text
    • http://abnicum.com/files/file/paburagix.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e4e13048ddaf3c31235354c5a9ee1bab/saboxegemetug.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/80205531896.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/nilezapunesitebovebisa.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mobusunefapomejelalas.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/81923230361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+meaning+of+birthmark+in+tagalogPDF 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_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 16808 bytes
SHA-256: 571e4b43c6c0571e83053d13b9ffb26d3e98dbf016480226600611c0ca913fb3
font_01_sfnt_off00012edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 10888 bytes
SHA-256: 502bb7deb884db53dc66667af94203a727832b448cd7faee706a10a9e974e380
font_02_sfnt_off000147de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1