Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0e5bc5e81b9161…

MALICIOUS

PDF

85.6 KB Created: 2021-07-27 21:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6fccbe1e35136540c7291aab0d064bf8 SHA-1: d0baddc50a69ac6121f4f50dcbdc68b9612f5866 SHA-256: 8b0e5bc5e81b916133c5a79de04eb96c8773361d11fc6c581bf8f000847f6b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f616b33c---nugekuru.pdf In PDF document text
    • https://abofahed.com/userfiles/file/44135504898.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dukubi.pdfIn PDF document text
    • https://mmszke.hu/files/file/vazuti.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609845bfeb06d---8571232958.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ada531652---nepoduvafawom.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c4fece28d---nakizadukafuperasilix.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/489ad19c6c0b5c15e615884242e750b5/49105411775.pdfIn PDF document text
    • http://kfbi.ru/content/file/27829104874.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/wupokivonoz.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xofetaselerukenutabamevu.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/murelosokovomoroliwetel.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c38fb1a23bccb88fdfa2f223811cc927/75113482125.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/85522106228.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727fffab288---29021474382.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb668a---peluwabab.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/2970222835.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/38323261774.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080acf0ad0be---95261337141.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/65153693912.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e35c87bb---83083421209.pdfIn PDF document text
    • https://kristinanamaste.eu/files/jesisibuxiku.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/juxazuwubutaramurofurov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+libro+el+reino+del+dragon+de+oro+pdf+gratisPDF 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 10936 bytes
SHA-256: f8349a3ebf7290d69f2c8d096bfabc9c44dc364b3a5c7033bed13234ec8b12c8
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 18812 bytes
SHA-256: 7db5d1bd033630c99e27771daa7bc0c86025aecdb57b7886d53e789e921cb6b4
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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