Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acb3a8281178807…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 16:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1026256fb644c4d165a77304a1d7c67b SHA-1: 45120cb5e9aaa97847b24424597887420033196f SHA-256: 3acb3a8281178807865f7f17ad9afe8aa9b981f7b057885d405f7e34aa97be3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly support its classification as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://rainbowprinter.com/app/webroot/files/file/jomikomuwevopapuwi.pdf In PDF document text
    • http://stalmont.eu/userfiles/file/95938185442.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607960d01f00c---95934058225.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/77561870235.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/21194958347.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/mitiradozuvikuxijami.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-24/20210724215317379620.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/0e380e7d2086343387894abac6a1d2c7/natazadesilodaluki.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa64ef0da8---zarule.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/39741800077.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0238c1105f---tametozigi.pdfIn PDF document text
    • https://finomisgurukul.com/public_html/userfiles/file/gunavokukujaxirinitur.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b09330960---josuza.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/sakonodobu.pdfIn PDF document text
    • http://kco.su/userfiles/file/78308236789.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f918b84a9---bosigidadeteduferudisibif.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f5b16b96---64914201809.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/befavisurobuwekomadeviro.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/sifizonagatusuguwarudib.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/76332929778.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/tevolafezi.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/gineboralewutixogur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=engineering+lettering+guidelines+2+4+4+pdfPDF 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_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 18096 bytes
SHA-256: 2e188b1f21d7e88a7058e7452eb437e61f4e78e70301ffebaad36afb5212f489
font_01_sfnt_off00010169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 10672 bytes
SHA-256: 339e1ab1a7688f5793e9350ac11715d0b258e11cd8366a2b5b9a785bba4b0449

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