Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca3f028786f5819…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 18:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10f2c75c748a98e4a923747a537ea009 SHA-1: 97c22870ddb39b8d4e72fe50e29ee4f70f0d80d4 SHA-256: 6ca3f028786f5819be2205dcd5701159a09b275ac0c0180710b9ad4f80ac9b6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous URLs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://come2menorca.com/images/file/50687297339.pdf In PDF document text
    • https://landtop.com/filespath/files/20210901204841.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jukunupisopawufisifaj.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609965766590a---pamisuvugexisexov.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mpc43v83m9lbiu20dtnra73kq8/2135536911.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ff1f1aab78f5d26d5f6234610cb68573/74152478299.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/sebojudono.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/afd448f0f6ebbb196290e3bee28c878c/67772535517.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b737c9f1473---22030558402.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02410fde4---nitesukemosaranujobepot.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/soxedarowaxavobif.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f81a915a2eabf4e2f61868eb2396bf63/sabav.pdfIn PDF document text
    • https://go2germany.ru/files/file/nadirejirena.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/moseriditin.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ef26d8b465a7e54529334bec3f3e855/wezafukiribatipadonigorat.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210818205042.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/28486921154.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/mizalup.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cce191132c527778ec4fbf4f13bffb16/52283210216.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/97051842058.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5360c2b7---vawoxowipepug.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sewabikiruwibebodesuvadu.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/tdn41oh63jsjq68qlvtc85lpr5/36564712428.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b55bc6cbc---69343113349.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/98838809668.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3id3s2r27ha4g4ib80q32cufvk/bugovonisalegobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tellus+s2+mx+68+pdfPDF 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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 19388 bytes
SHA-256: e33f5f4e0a80cde61cbefcc5fed326dfc2cc79f88ce4834ccfa9c08f6e7ef4e1
font_01_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 10644 bytes
SHA-256: fc52f0e1d80f6b509abd4aca4200a95e8b5f5170656497cd264174646fe72423
font_02_sfnt_off0001268d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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