Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54394a2a63ca6d1…

MALICIOUS

PDF

80.4 KB Created: 2021-08-31 15:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 850a10eb026c16eadee6d3e8c7f02c25 SHA-1: 21d61b32109e2703eb38cd8122a362bdfd865190 SHA-256: a54394a2a63ca6d1f0396f8d023524965970f52e65cf3e64e43a72790b9b9197
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a1b57479b4f3f602ca5e8c8925374b8b/10770186417.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///20216763723579.pdfIn PDF document text
    • http://2440027.ru/upload/file/garapadapoxoxonijerutajo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/jep6cpcqafjsgn957g026hfdkb/mopozudanibepe.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/83856133420.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ocbv1rm6607gelbb514mdv6n86/48727547668.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612006b5da5bf---43959446028.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/76926294513.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/jerok.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/14008512328.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/gijuravukavuwakawiriv.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a55f396495---nazunatix.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/kikoxaxofatekurinagumija.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/2583180508.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/30956004041.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e409b0b8a960da76873092eca8109c88/sesubu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b2f67f64999def0caef9d0c55b0bd4a0/defamamajasurivudanam.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4fa10d2977d73d5967a06c20069ec94d/xagab.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/tafupi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36804ea80---fokifobipetiwenojajado.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vqavs7ducd45lh782hsktgs3b4/2227223710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=guess+your+number+trickPDF 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_off0000d74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10668 bytes
SHA-256: c9478fe6d115e436ba0e8843f5dcc7285df129abc482c77eb946fc7d421e7caa
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 16948 bytes
SHA-256: fb3ed57aaeb0d602632fecd9bdc414ef99a4f52301d1ada31007da3567b2dc93

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