Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1002f32b18ad61…

MALICIOUS

PDF

75.7 KB Created: 2021-08-12 17:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ddcc3a34974bb6185fcbd543ad0642ef SHA-1: 5a9054bf7c8f2226d97cec5dcb209d941dadcae8 SHA-256: ee1002f32b18ad61ee3ffd0ef83915a740bc861b719e27c0ce1a49db6a50e881
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=imperative+verbs+worksheet+for+grade+4 PDF link annotation
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081c68e4457f---35333063424.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/25391282434.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/68422306564.pdfIn PDF document text
    • http://yilip.net/userData/board/file/futezulelajabejizanerune.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/31705890450.pdfIn PDF document text
    • https://codecs.roimages/file/jamimido.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd138bd75a8---85408353233.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/37034612891.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/73473308596.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813dee8d565---kopawa.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/12974527825.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec4fab700---82098148880.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiiotjli4ti5d1glqee921tqcn/disajofusekun.pdfIn PDF document text
    • http://chinalabware.es/d/files/nogirajuvevajowezotu.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/66974429103.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/79961429275.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/6261556819.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/66342594773.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/83665842080.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/14379224544.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/91fd51d976798c5d5c099405c1957bd3/kujuwivadek.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/74997039952.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/5904083718.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zogomawewipipikopuv.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_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 16292 bytes
SHA-256: 4dda84e9c325bdc7e6aafdea7ae4348a5be88ad4d183eac4284d26d4d0d95ab3
font_01_sfnt_off0000ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 11208 bytes
SHA-256: 35c96298ccea081b70b96d14f2562cb71c6147c662cf2a79f3c7254b99e1b216

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