Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b85800f63ab754d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 00:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9eba5392a691731b02d9a1f11be28a2 SHA-1: 3ebcbb0cfd33be65e8577ceda1e2d0e90fc1ed4d SHA-256: 5b85800f63ab754d91f92ec5306b54d19569a627361fce4ea1a1ee1657590ceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16105e25d81192---76643066196.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00439c953---53427727023.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/15223847136.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/57257176748.pdfIn PDF document text
    • https://lesura.net/userfiles/file/19630896131.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/votodukotudonojuxo.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/lonuzafesogedopifa.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9367ccb3d4726e4e2e1729f7d32ebb4f/sorefikato.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/edpln9pvhkhl9jteft6rjf932o/19377495980.pdfIn PDF document text
    • http://cityfate.com/files/files/96930462356.pdfIn PDF document text
    • https://agermag.ro/mm/file/pojoxi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2249c337---rivowibunoxozajulonex.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/xorelitojokokaleb.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/ramiba.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/nopupejabolejogawixe.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/20697189789.pdfIn PDF document text
    • http://guitarenko.fr/img/files/rerizix.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/769d9e1bf9f654df427dc58a57594cf8/refirafojagabarojex.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/4eb2188c6e9c85e0dff523751fffc654/kikutukalivojete.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3a9e1d510---semaxulole.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/14133411782.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gtge1qo8j6dnqr3l2s2uo09vvb/32258200808.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/2046c36fevhgd02j4gd7i26nr3/pafewigowum.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/47748688100.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/65472c0463ba3871047dc27bf632609b/39184049922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=stretched+tendon+in+kneePDF 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_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 18068 bytes
SHA-256: 7d7bcc4b2b9e87a2e77b6bec00f918bd9b7f90e347e697386c27db70eb9670ca
font_01_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 10256 bytes
SHA-256: 331bf774da896fc27f0d1046ce2d8cfcae0070dc1f36d28103bdc435206914b8
font_02_sfnt_off000126ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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