Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea01457d7facbfe…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 21:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be89ae2cacd74fde5ce2848355dd752d SHA-1: 6769768fe8a8ce6fb33b271f678dedb55ae79d6f SHA-256: 6ea01457d7facbfe0cac985a81fa7b2524dfcaacfabab2ae1a51d4958b74e173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=bile+salts+in+urine+pdf PDF link annotation
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c26ecebd4---65573865942.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/34341273337.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/84671424551.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/nuzisef.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021070221000970554.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/rameboruvexisoxuvufekovez.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/juwonesini.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff4t6ogk5vo4q1notirsjh9jo4/53218342265.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/95279743272.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9f54368b0---88813450208.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/9808940356.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236075758ea.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6176299de---31971526130.pdfIn PDF document text
    • http://budka39.ru/files/81683318519.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160742b850d112---xuziletijanotedizixejifo.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/tezibovirepo.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcae4dfcb---38297522502.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/fijijevuneguw.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/zajakutegula.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1auscqap49q4rqugg30qp7lt80/78029788692.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/77215266904.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/39727362792.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/kelisozedanorejikutubuwa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a61f9ce6175990d8e71f3954e475e472/zuximuzoso.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/dugexagoxonavol.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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10524 bytes
SHA-256: ae864d269e5889221e51bad3a339b08ee0e58c76602323368c2cd4856ce82cb3
font_02_sfnt_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16484 bytes
SHA-256: 65993a46bf98786522c63e3577ab1920f2446d1a3c8f423ed90abd4c18c213a2

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