Malicious PDF — malware analysis report

Static analysis result for SHA-256 081e577cc4b6eda0…

MALICIOUS

PDF

104.7 KB Created: 2021-08-16 14:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 99eaf30fa7caaa57603def50b15c0ef7 SHA-1: 1ff6a2bdc80fcfed39200b85841c43605a3deb98 SHA-256: 081e577cc4b6eda0ee37376cd127a7fc6357a2d6133a1cf8b5f095a067cf1ed1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable domains. The document body is unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://confetti-seasons.ru/upload/files/rotebakejaluzirigadixajo.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/1ef99ee8b0147ddd20f5865f78081325/80627183863.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87265576187.pdfIn PDF document text
    • http://hasyo.net/files/file/13663892827.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/sadonabujiwidovegebobedu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae755135e06---jurupop.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a916804ba73---geleva.pdfIn PDF document text
    • http://cloverdiamond.com/file/pegorexudasu.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/6543728373.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a8b1bdf4---7499354102.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/lazesajokiniziduv.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/kumusolosibij.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/fajovebejesufunagiwunav.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c986526c8---denunigu.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e8caa63c4964abaa0b4cf8ccc0915d2f/23500580771.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sakonukodabigapurinotex.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/mkrokht6qav6nc0kvqqq54qr2k/14255349742.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c60d3a45---61453807278.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/64962832190.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/b34cb814937e3217999f4882e6bdb99f/40102677738.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/dedekagevupuseva.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113652232f95---niritumow.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b404d9ede2c---81239243367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+improve+the+amh+levelsPDF 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_off000134d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE9 19124 bytes
SHA-256: 577b47e95dfc162617269b33e7ca005b824c4531c0fcec26daa9ce26567078d8
font_02_sfnt_off00017d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D3B 10556 bytes
SHA-256: 9b45d458a3c4e138d80dfe13ce7673f8338b8e250f663fb18cebd5939a51fa89

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