Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3cd76163f2b01e…

MALICIOUS

PDF

72.6 KB Created: 2021-08-27 23:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc10e3cc7d531fd84787c1e0bb35d556 SHA-1: bfeb4f029de695810b6d41d40b2971ae4300d47f SHA-256: 8a3cd76163f2b01e152b57481a2dabc9757d6730b97e1132fab9718b513166f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=dope+working+for+government+department PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9c9b1135b90e79b19d433086d0f069fe/76786057157.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/modulibetodarazekurug.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/412e9092a508749bdf9cf5e5336cef6e/ruzidifekavava.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/22b24b605cdab898f8e57c457a66c5e6/befigiwa.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/webalupibogabepoja.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7ecd52b05d35cc03869be9e01a2e8394/80423664922.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ets6fgj96fmrla17l1knvqqd3t/42076402415.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/fopozinisesizinot.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/pubigojadepazopalixefuvo.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/demij.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/fifaju.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffe0f6802a---lebezewinor.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/28117484864.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/c7239af5ab2afeb8915684ffb0c94c33/mojononuf.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/17cf0fdc381493525fc32720307d0cf2/lujes.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/vurazup.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a28c24d9af---risenuneganujigaxogul.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/29638660552.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/bavebimofiwijakiwox.pdfIn PDF document text
    • https://digireg.com/upload/madugofatofadavawebufuwi.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/juritosidasitibuj.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1e521b1bf0056a2d9752432a1805dfd7/17376763717.pdfIn PDF document text
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/pakit.pdfIn PDF document text
    • 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_off0000ba92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 16296 bytes
SHA-256: 96744aa32187b634c3e0d5432542e491f2eaa44592a82d584eb1ddab32480191
font_02_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 10872 bytes
SHA-256: c13d4a635354bf6d58f78ef2757d0cd0728b40f9dfc5a1a13ad0e73fc6c1f047

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