Malicious PDF — malware analysis report

Static analysis result for SHA-256 af19d71c0ac86588…

MALICIOUS

PDF

70.3 KB Created: 2021-05-28 07:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 41fc77d41a160f9f461b7f9ffa7f83e9 SHA-1: 2e207cf3ed03fe86df02bdae8b566399e22385c3 SHA-256: af19d71c0ac86588cb841bc88c06a77c6c0e1d74a3dd026c719a1f5e9ff14844
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a48ca93d---20033161500.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac77ecc0e---94485122920.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/284fe72307696c8cd94a12812655718c/nibegebekegunubetonipo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a96cd7cbbe2---kodurobebizuvepapu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa651f8c3e3---kopilenojakujiga.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e27c33507e5889123420655f82e4160d/tuloxelaretuwew.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5ldebjj6bfpl9lqe544mpc4u1j/buzedefotekegujopif.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851d24b276---gemoxireguzokisijavumoz.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051110453273499.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d15udivr6g8ftc9j5eig0emqcq/jolamesobaxebadidupiw.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/d38n62ip5bg190a7ftj2uotifn/vakiwuvefufedikubonedelo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdbf31210---gaxawitebegu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4n7anpqprse1ceg56e1754olme/82928479678.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/55915502996.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kujidubijovafelowi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/220446bbafb8b000baeab417fc055f65/44677165707.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/~3/1xuhb7AK25c/uplcv?utm_term=o+que+%25C3%25A9+movimento+circular+uniformePDF 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_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 5204 bytes
SHA-256: ad5c70348d1abec5632b430ee00efa22848e0877a734e8617df25ef1a0776f2a
font_01_sfnt_off0000e39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 12504 bytes
SHA-256: 38e74184c91c7acbfde3b037533fbc40b8a17a4a620a2b2fb4d53b4248d5b14b