Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9d0cc2836f5307…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 12:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9facedf432dfd22fd4bd731f2eedd58c SHA-1: 52c37d7f45b8264308c7e47131d5fccfb8115e5e SHA-256: ea9d0cc2836f530703169436168dd06c05e43596ae39f111aa89118275b58634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing multiple URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. One URL, in particular, is hosted on a domain that appears to be compromised WordPress upload storage, suggesting a potential distribution point for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://kingcraftviet.com/uploads/ckfinder/files/nunami.pdf In PDF document text
    • http://namngonviet.com/user-/files/49246807093.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/jubapowofuluvonomim.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/553747791.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/fezusok.pdfIn PDF document text
    • http://delve-cr.com/uploads/vofobaba.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/xiluxudozogu.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/75844730592.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/aokra43eo9obmgnraqljbmiio5/88104669662.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/67709250327.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/vuwesufezolezanube.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/70394243910.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613326d54fa19---51358655964.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a80162f09---goweda.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/rirozifu.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/44372987094.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/57614199765.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/80636726471.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10564289544.pdfIn PDF document text
    • https://udruga-invalida.hr/files/36093765784.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/vamowazekopejupofobu.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/45183247234.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/33158982858.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/ragowopumigozojotel.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/85777282878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fruit+cut+game+download+apkPDF 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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 17580 bytes
SHA-256: 72d06a0df12d02241e2736e761d98cf65b11155201e953aa54ab2b3d83f345ac
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 10944 bytes
SHA-256: 8e6e631d74b59e0791fa9b43eee702b583f681ff0138a7277463d31f04f37d3f