Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b7f7283e71bb8…

MALICIOUS

PDF

79.8 KB Created: 2021-06-18 15:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d055ee4e42d1f49ec0c10016aa6a4719 SHA-1: fc71fcfe56282ac7049cae0e54323408d5a04bc8 SHA-256: 430b7f7283e71bb88f85c202752433514c78a7a0799ad80b0238f68a963b9605
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malicious content distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a lure to download potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/j354iikl8p1679gn8e6hid96bq/44425561905.pdf In PDF document text
    • https://castel.ro/userfiles/file/53932369917.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39a70146e---wumomilim.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/votufalofimuk.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/22317186977.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/guluvigoxolerivovola.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef883a74e7---belamixovawaxadowizukog.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/84192e2ec1a9e1c8c441aa1d9425156e/2251610297.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/aidao6rmfgdlccb7o1f5u7pfqa/46038537983.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvtj4n3tkjjgqm8d1s9oh5lv6p/56025524929.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/zakagaxalule.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918d852c2ba---loberagijawajut.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/05921ef0ded9c1dae0a412e909c86f3b/83996263867.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gj65egubbm8ufmeh6k4qk83ch3/ponigajaxuvujavidizuw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff856e454---62039324652.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/zowapav.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/fazopofafafunorumilav.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/resonezazatuxoxotazasozo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=green+screen+video+download+for+freePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 5196 bytes
SHA-256: f0ef86af267a08decdc6e3ac7d25c440ab5f7878cb6f4dd9eb74a35638fe4a01
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 11012 bytes
SHA-256: be6d2a5e225865ad6a115dbc32afbac35790d3c15446bbcd9a55a4ce44ba27fe