Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af89397d8a69915…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d4e50f8e08efbb530939deb581adf87 SHA-1: b2f716e337258371595a0ea37a4bff9d197e003a SHA-256: 9af89397d8a69915695b9937d53edeeea469c1e62814034306a86bef39d4ef4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress sites, suggesting the document is designed to redirect users to malicious content. The presence of embedded URLs, many of which are hosted on compromised CMS platforms, further supports the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=surface+area+and+volume+of+cylinders+worksheet+pdf PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076614e83435---tofudedifisi.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/gufakinepubagudotuju.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b8893218cce154be8b583a5b7879240f/91618405706.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0841078cb9---21849476704.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/da89ab28826730913487647903b80204/pizedazapovupamilufefove.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/karikanuvuxugasafub.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/fejose.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4541c9104b---nepimapopefidalasupubis.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/daijuh3oej0v04df8cpo35uo0a/44814390187.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/kegizadux.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/64868756913.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/3jug5t4v9jmeuefjjs3p1tu9a4/89740602524.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611972b336d25---puxogunupo.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/454778393b0dcb1decec0b81c75506da/98246710641.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e24a8e171---nibusudajixifarapoladu.pdfIn PDF document text
    • http://cichanski.com/Upload/file/91863534557.pdfIn PDF document text
    • https://paradigma.bg/uf/file/perusuwop.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/geritogekabusewefexe.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/nogeramelilagof.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/43484614950.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ad42617893d6607185d05e2b85020e87/48035510816.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b50a607dbdb---tadopininerenaselozugurug.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/nebubofozajubenirumerisa.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/fazitegenozijajo.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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 11416 bytes
SHA-256: 13398f909959c475d32585fc6a9897e0e61bc1cf208a9167e828340c3c8a6cb5
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 17744 bytes
SHA-256: 4a2c7dcfad54174e8775f62c972813ffc2ddc28106d8e6a66feb4518ad98414b
font_02_sfnt_off00013025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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