Malicious PDF — malware analysis report

Static analysis result for SHA-256 744d8e62c3b8869a…

MALICIOUS

PDF

142.3 KB Created: 2021-07-01 12:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9eb065cbbb0cde4a5ec06ed236d88a54 SHA-1: c25e03834bd9a15329d61f82cbfc3fd5d6b60ef1 SHA-256: 744d8e62c3b8869ad9c119c959062958a3d2e1d47992035a8ad9737e936ce333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e50e781c8e7e552d9c3ae0a9aa352d42/44792360832.pdf In PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0edbb759ce6fc3c47153055fa8f8c3e9/62020313611.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/vifarexikikadazob.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/95190907590.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/99021242545.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/7bad4a7bf59432178c0d417717ef6b74/82427255164.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6beb0bd159ec278681d258dcf7e45af2/bapidojixudemuludopamof.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/girixozesewarilagaxa.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609582c01288e---90220971483.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/mepum.pdfIn PDF document text
    • https://kermanrooz.com/img/files/63699969315.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9e159547906af70659fedd16a03fd15c/26614385246.pdfIn PDF document text
    • http://mebco.ru/images/file/fewepawo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f48eee44bbf6d11f08151d797514ca48/zofepi.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/mutimiwetesa.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9e09dbe0---gudokibupale.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44125d2504---kegij.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/mafuwenitefuxoxorinegow.pdfIn PDF document text
    • http://dentherapia.hu/files/file/tenoxiwuzoxafovidumavonir.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e51fe63fef---fagilunure.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/37427929605.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/rogigijak.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16095344cefdd9---96740782478.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/77914418029.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/87306250995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bounded+rationality+decision+making+examplePDF 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_off0001c984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C984 17888 bytes
SHA-256: 68773c5ba2bc446ddeaba2289f134bc938723d2f62aa1cc29081d8dfbed854e1
font_01_sfnt_off0001f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21093 11316 bytes
SHA-256: d30ecfc4a4b62a6caa3b4abe721f8b5e05d83c4ec783caf707d6d5a359579c9e