Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fe0be895f53513…

MALICIOUS

PDF

70.2 KB Created: 2021-07-21 11:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5c925ebd2107b90c6c97945ce5312d5 SHA-1: 581a62c51b45a789567c90ea567bd2023659351a SHA-256: b4fe0be895f53513fbc8bbcf9d2148bd17025e762f2edf637deec963d128ebf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The primary goal appears to be redirecting users to potentially malicious websites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/76274821489.pdf In PDF document text
    • https://majorsagilekvaros.hu/uploads/file/58524461267.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/93817753576.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/20877020792.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a051ca35461fa6cfd3fbfbaf3d4768c6/8018211606.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/fadinawagulefajugi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7b168e8f---tamexokam.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff0888637---30538894513.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/98637145750.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081f650c3d79---tadamedoluxofudivolol.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c3f1c86d6be27e2586c2ddf31874d011/legenewisegulifovifan.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/rozavilipiwe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tlm9arv61lglt2m34d7nh7p6a5/57853076260.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/romat.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5d5fb72c6e2203d90696ee0cf152d9e5/duzimudobikiluf.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160723d2aec74d---zibul.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/dezefiduri.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e662f1d5207---kinopobexuviku.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608207699ce84---61044841166.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606da04f548ab---44713318939.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/43499168495.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/mijetimetedebalu.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/17581407220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=staphylococcal+scalded+skin+syndrome+italianoPDF 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_off0000b265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB265 15408 bytes
SHA-256: ce63bf23af3a037f0f14eef7a4e0da463a4b453f3f7e18bac0deaf41c5ee4876
font_01_sfnt_off0000d9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 11060 bytes
SHA-256: 95689cc3770c384a1ed2072bb0cfc541fe8d26259bcaddfe077802bc8e74b9c8

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