Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4f87d3eb404005…

MALICIOUS

PDF

102.7 KB Created: 2021-09-04 13:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d6783863bec70e4a5a22b5c73b69731 SHA-1: f49a2111ae00f537b4d71c030830da12bd3269a3 SHA-256: bd4f87d3eb404005f93de2d678288f1483f569ff339956b4794bde0d6da15733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://krisoc.ru/uplcv?utm_term=bernard+stiegler+pdf PDF link annotation
    • http://khamtribacninh.com/images/files/83897040486.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/padexasej.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/60904921738.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/busofi.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/9375866489.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/14217d06e24636cc6ed3839ba2f6bc12/jokejokofipenuwij.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092668908c3c---fenuluk.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/gijupudiwif.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hilfa891a4naebpp7c5bqt9q82/xebagimibinasiwivuteparep.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f014c0f3d52---bozula.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/46270480634.pdfIn PDF document text
    • http://parentini.it/userfiles/files/32843455815.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b5aceea85bb76879ac089d6a17def5ff/fojudatum.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/9eflo3i1kfhrpeec9ku9j9tnjd/31853777975.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/p02udf7sjg512818or8tpa1t34/82005107218.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/buzosukumomiz.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f9c5008f---2284323373.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9f1ab8ba---1837287396.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210818024657.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/momufu.pdfIn PDF document text
    • https://luminex.pl/upload/file/62307901755.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/74643554650.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xoleduvoma.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 16876 bytes
SHA-256: 774f17a6c91b2740c3f159a243d2d4798005e0e6b1ccfac6eeb20e484910bc8d
font_01_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_02_sfnt_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 21440 bytes
SHA-256: 3fb7a5489d701f89f2a4148903ae3065edbc5c3a52de628afe16e1b13cfc6606
font_03_sfnt_off00015c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00017430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17430 10604 bytes
SHA-256: 179ea29c90e06768cc27e4ca1c4393c02ec359fe25f05d20695a66765ca7ac43

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