Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8546a8971f48ba…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 03:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfd3aee4b1aa62ba2c3fe810b45af092 SHA-1: d12821de701212381ecd25ece2964647252d944e SHA-256: fc8546a8971f48bac6ff1f53a899d63588f8802bf28ca74faa216b723bab11d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and upload storage locations, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://abandassociates.com/ckfinder/userfiles/files/bibonomub.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf995570c---wozepizogaf.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/dukinamalunibiwi.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0049843ddae943817ea90ea76aa8f974/texogokezivu.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/87641195923.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/91670812745.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/kavusupagubinox.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ce2c441bc5ecc8aa265ec85a575e2a01/vareporeg.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/liwovo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fada271d16---78618830871.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/76565406863.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/viwaxakuwubosonewazowoxeg.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/95911584218.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/b1f94ef4fadfcd1644c44e8444726b98/8747975641.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/59ba9dd5e7a40b8788d92704a359ae13/45277348679.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/32472306677.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611418f727f66---lenitidetuguwik.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/56427666510.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/44294511276.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609c70397645d---mivevezexawufu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6ae5fd765a6c5de5fe3291bd2f2fd4ae/fixibajirezapomaxu.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/kiwad.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/24708130782.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6b364669390478f78942f6f2fe0d67f4/25133659642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=convert+doc+file+to+pdf+onlinePDF 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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16952 bytes
SHA-256: f775739438c413b85e7fe2b903cd8d77efd8c1ef04f9fd2dda4db626e0d6d204
font_01_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 10380 bytes
SHA-256: bdacc9c1ee86c93c0f09992ab376674ca25b55c0257db5d5e4648c40023fbf07
font_02_sfnt_off00012280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1