Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c9a3c83a6bfc97…

MALICIOUS

PDF

96.1 KB Created: 2021-07-18 09:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 676712673b027016f7839d71a414c8c3 SHA-1: 092727cff73814458e1061b8d5a8c057cc357537 SHA-256: 18c9a3c83a6bfc97240a16676415a264d979260c9bdfd956a6e065c9256854ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to PDFs hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2b2fc8801---39232571153.pdf In PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ec9951d6---2031027951.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609248aa00172---55331916915.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/foxovurinopelezeluxosose.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/87982288f8dcd9692a322b241898b879/kovijikesebe.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/xewitexepupasawesuvomi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/fc2ef0d78e9a29c674c7a55dabae3253/28442666371.pdfIn PDF document text
    • http://nakatka.com/files/file/bodijosufira.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h7ks4kejuo11315hqdcvb1lb07/dukotup.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9f0d76c09---vatujupopamifejosoguvi.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c7954c7b---63147748136.pdfIn PDF document text
    • http://siembra.me/uploads/files/misenimovofi.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/98fafb0deadb66e6c7077b13dae20679/86861331098.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081847dccf8a---popavolaxakoxufujo.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/timifamomigamidisina.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/56751649625.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/wuvobuvikijefi.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/radafapagoj.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6d85a962---33552267694.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d03931867dc---48804796877.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/89800776489.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/nejomarotejobizes.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/99368910540.pdfIn PDF document text
    • https://medtek.vn/storage/file/68992220122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=think+and+grow+rich+book+free+pdf+downloadPDF 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_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 10912 bytes
SHA-256: baefdd332f6fb5aea9b9e1e176bddec90925d599d62717ce5a2ad0c36f0bac9f
font_01_sfnt_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 18648 bytes
SHA-256: 2cf1ec2ee584d128c9fce6da46308e837d91fa42aefa641c1d0b9d96e6d71da0
font_02_sfnt_off0001594d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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