Malicious PDF — malware analysis report

Static analysis result for SHA-256 5529f89908183c35…

MALICIOUS

PDF

77.5 KB Created: 2021-09-04 21:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e06a91a876e97d7c813e0eeae8156c3 SHA-1: 2d0af1ce5978f76bd24084c3718ef6922e7fa4a0 SHA-256: 5529f89908183c355c2a0455498701754fb8c4ecad6fb61a7239b18d747fbdb8
164 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. It contains embedded JavaScript and a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting it's designed to redirect users to malicious content or phishing pages. The presence of embedded JavaScript (T1059.007) is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://hasyo.net/files/file/nidipopawunapa.pdf In PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/34843542968.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/zitejejavelugagusasetemaz.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088558875203---48146775212.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/banenokuwenixemowovekaki.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6db6d79be22209ed053f46636427de0f/mevenovogoka.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/3341105517.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/befitewujolarakiw.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/54411585359.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86f328b0d---86700841028.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210609070657.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/23079281798.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/69184376570.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/62fc0cad4136255a43f9b10f2009c5d9/14354671538.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/cf7caa47b4af801516e8ff9aa1653381/morijukikamujodimeleximo.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/07e3a5f50e7754cfad75a843a393d6d9/18239764304.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/82388157280.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497bf15504---kiralugekutumaliwodi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c66d8e74275e3468272ee49604d3853d/99755651963.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/lonerisokunojodudazotiluz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45dcae144---71425489432.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ri3u8uccdth9l9grf2u74ga4l1/fifib.pdfIn PDF document text
    • https://afayl.com/userfiles/file/48330499152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=agricultural+science+business+plan+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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 10896 bytes
SHA-256: d2a70425b5fa33b71fe17acd30303957d3a4deed7832b3f4d7bd4aebe08fe7aa
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3D 16496 bytes
SHA-256: a0a6145dbaf40145923308dc8815499f08adc43dc77b9a40a9a5f7c9ed45ddbe

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