Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae541634423cfdc1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 10:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 80cf98c5a54016d5e3e7b66c18f93978 SHA-1: 3e89c28806431f73b0ea3b4ae8e3ac1facffb819 SHA-256: ae541634423cfdc1ced07cb109d8b49f49b02e0e2b27d71c8fa6e39ba23be832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=statistical+mechanics+pdf+by+reif PDF link annotation
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098558e003cd---36060060643.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/kafidezatakokelefuwepepo.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc6505f10---99870648239.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/16681864193.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/1289190876.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9acm26q3519l8tocomldaidl08/58086164627.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a7888c35013---96707123011.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c29p20lvrhf8il0rfvqiftqia1/75431082525.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/34411138270.pdfIn PDF document text
    • http://pk.mo/userfiles/file/19064701486.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/revusonivanukabu.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/47964101529.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/kuzudujamenusedizaz.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sejobuvipasedaxajonodak.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/pijisafagisomezetug.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fb748e21e874479714cd269ba81c36c5/deruxogabifiranajegewu.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/jezikafixol.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/68651054321.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/d5050e6b52e4498363c6b2aacd1b6bab/bunipivefesi.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/kuwariben.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109041021432817.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/miwejifize.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_off0000e06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06C 17520 bytes
SHA-256: c16a6ed0cec22d93633af42430abbd100bc247e70abc2957844e3b77e34a3ee8
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 11092 bytes
SHA-256: 06aac9534a59e4ab2a7f21673c4be6fdad9961c1f93d0065388534dbb3238f5d

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