Malicious PDF — malware analysis report

Static analysis result for SHA-256 95aca7ecbacf2c99…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 21:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54bd6cf15f853547932913277a2dd66e SHA-1: fca6038a342da4633d754b1dd56de735d3102b6e SHA-256: 95aca7ecbacf2c99b93de004e70a346b7538d60dd4f8966fa8d76b729a28b986
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://seeandhearbetter.ie/img/shop//contents/80477569351.pdf In PDF document text
    • http://ever-pioneer.com/upload/files/buxejit.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/lixuwezupososujipaj.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/1456732455.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076e871df90b---kowozanuk.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/3625489213.pdfIn PDF document text
    • https://vpmemorial.net/images/file/kekubux.pdfIn PDF document text
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/52072328514.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c430b87e5f9---44145778091.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kugelidedoperiji.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdabf3bed0---rawotemosituro.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/dugopanotagat.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/83d0ad7edc207d5c6bce7476a5b9769e/87835157813.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/13962029147.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/padelune.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c18826dcd---28631394981.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc0cf6c94f28f5b0cba65e13eb7462ca/8539813291.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/kedokuzotoviruzakozafo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vutemuxagel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4988a6da2---44648410371.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/1059801a5306c017a640832984142eb6/xerulituges.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/79711242719.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/224id4pp54hrti9195car1mv62/lopexakusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=purple+goes+well+with+what+colorPDF 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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10736 bytes
SHA-256: e6cbc29943b3d7bf18b9f53e573ff578a4577476219cb34079b0bbbc743d5dcf
font_01_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCE 18836 bytes
SHA-256: e95905b683e4babfa5866b3390e5cf4ade865ba994db7f24d811f834e89ab7dc