Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0716bad9bb9a942…

MALICIOUS

PDF

96.4 KB Created: 2021-07-24 13:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a1836de72562bb81cbd5055e4c9e84a SHA-1: c9d95bcbf79a524713b9fb4e97820710de483b87 SHA-256: b0716bad9bb9a942eb539b317530dc624279bc94e7abe238f4ffbfd913f55fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely intended to host phishing or malware payloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d6drhulltkupll1acu2u5a98e3/49454457457.pdf In PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/18873935302.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/21241945839.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c49f81e3a---puworezi.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/fasinupa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qsucl64pfto1ha7afejq4v4qu5/sarosibijulanukura.pdfIn PDF document text
    • http://boxethai38.com/upload/file/25512945824.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/mdti49e10fdufui4e1v1j7jash/30314215961.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/86000532120.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/joletopuvurekemukedirekix.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf58aecec0---96042596583.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0d827f4f---futorure.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e96dc5c4---vugimavoselajiselu.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/digejetavafavibexurop.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16075e65d1ee83---41491422071.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3490a76167---piwupu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/61309866525.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab6f7d60ae---69188021062.pdfIn PDF document text
    • http://valeneighbors.com/userimages/jegovamimujunazu.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607404a625f6a---gakaxogesuvutixikajeliziv.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/nadofosukozagizowubo.pdfIn PDF document text
    • https://kopari.hu/files/file/24386329836.pdfIn PDF document text
    • http://simonide.org/userfiles/file/61180083657.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/42429655768.pdfIn PDF document text
    • https://maclashoes.it/file/maxexefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=aday+%C3%B6%C4%9Fretmen+formlar%C4%B1+doldurulmu%C5%9F+beden+e%C4%9FitimiPDF 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_off00010d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 11416 bytes
SHA-256: 7012c9c74cdef5323550d18f0d76fd69269ed348c1f005013f14b9c4097c0c80
font_01_sfnt_off000127c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD4 20392 bytes
SHA-256: ae0b35778f419b7a0ddf372c470390a6ca39de214a98b087ece95e8d0a9613b1