Malicious PDF — malware analysis report

Static analysis result for SHA-256 261cd22f9c9efde5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-02 16:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2b304c9d3bee44f3661cf4d88b0e1ce SHA-1: 880dd8241f5dd5e4dd3ccad00e9ecd08c1176e44 SHA-256: 261cd22f9c9efde53890d28b53d8f1c2e3910c6d04c621b9cf23dc0f1d238652
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=dsm+iv+pdf+portugues PDF link annotation
    • http://www.ruben.pl/ckfinder/userfiles/files/41147962517.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/94607581522.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e8c6c4d17---jolojibi.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jogilujorivoserotiberabin.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53924069310.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/rimijunafonunefexim.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c656c1817---54847722609.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/42679500793.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lobopuxobidoba.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/43518854977.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/zaxekodobov.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vojaboralapulagujumufusu.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/52001449084.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa519d9ef---12592985702.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f222e3db---kopodemutanapavorokipawim.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/86018886460.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fufegusigaw.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/fefatulegaguve.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202107201703402007.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c89e7a5484fcd7f7fa0e14bf39409da7/16217907126.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/43476506380.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/xevalunabixefol.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/55268996667.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sanujigufefivagagefimotu.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_off0000ce72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE72 18976 bytes
SHA-256: 716f1a062bc4eebb35f11826dfa985127d116f0695550f0c15f1b14de3ee3fac
font_01_sfnt_off00010029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10029 10696 bytes
SHA-256: 96534001c3131b487a23f6bb7b6ecd7a0a9e645f4f36868b0b5434f63c7247fd
font_02_sfnt_off00011888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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