Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0ffe7db1c0cfe7…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7026cae3bcda8f6f9113b203319804c SHA-1: 74735c64b5c2577dbd32b36ffca860b19e293a19 SHA-256: 1b0ffe7db1c0cfe75748aec22ea3e64aadd96415fd4a10d63f353a095457b2fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=the+miracle+worker+worksheet+answers PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6343cdd---83821828177.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/wuketaxaxusala.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/296bc8641fee200fb9383a385ccc9d52/27817124119.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/99741271933.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/nefadusejerepujidamivi.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/sifikikilunatativilakakek.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/78408090482.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6473caede---voxuleweligepedomote.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ff725521809---39915884663.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bee94a95d---87439681431.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/18917388243.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cb889605a3e2c0b44125c8fa0e909ae3/ruxugepenubemud.pdfIn PDF document text
    • http://stroi-sistema.ru/img/19397914275.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/59167099181.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/medavuvesepoda.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/62862202620.pdfIn PDF document text
    • https://samowar.ch/upload/file/82391676343.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/mexapan.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/61148709960.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/25709046419.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9f1f2cd40d0994261a067436536a92b/76565950432.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/88733952948.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/risug.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://wipaphun.com/UserFiles/File/39943127279.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9f8f8f83994f1ec5c764917829df766c/tuzafoxugapetazopenegupiv.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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10636 bytes
SHA-256: b52d7f48baf276b8d89a4234b3d01f54a4f6f1f614bcc108929da034ad54f95e
font_02_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 16544 bytes
SHA-256: a49cc9ec416916d28898751946421c3c0aef8851d85b6e5ac7ca474980c70b3a

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