Malicious PDF — malware analysis report

Static analysis result for SHA-256 8934a2bcf948b527…

MALICIOUS

PDF

94.3 KB Created: 2021-06-29 03:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e3106666676bed1af001e738b072dbd SHA-1: 7d0e3583d2a5621901a72d0439d4ad8571ba940a SHA-256: 8934a2bcf948b527f8bf0a0745c83cb0674bfe47b94f60a64d436666a539b55e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many pointing to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or SEO poisoning attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • 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 https://archism.ru/uplcv?utm_term=find+your+life+path+number PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/60dd6db3d417f701b841c7274720d53b/26480270354.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccb4e75e3---befomeso.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29581a3db---watevubilotiviralazobe.pdfIn PDF document text
    • http://bscartridge.com/pic/vanugodok.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/mitimu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/d2a19695536a6e87c1e7eb0a8452b70c/3184883689.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/finomabemafalafu.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0db9a64a5---vogerikaretajozinilose.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/xojurakiwewikapol.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/95258281688.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/n1a2uhi34493h6c82rpq4pv767/bupadajugimemavagonabi.pdfIn PDF document text
    • https://bnovum.hu/downloads/14433002850.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/fuluf.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d913eca0407---35257327466.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/povesikorozeruk.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a721d620137---29246870884.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c204e25b8cd---vijirawamewejuweveduv.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/11979738947.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebfc9c9cbb---25212068594.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/abda1d66e1569bb9d926056e0aeee30c/11200249441.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b4693484e1067aae7652f6fc97f3601d/lapuxe.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/022e1827ff932ec5c5568028d9320683/34385781486.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/safoxuwezutu.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/gajidosiropo.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_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 18600 bytes
SHA-256: e8f1b4d1af1dbdf4009dc74cc9b912d82ab8f8f291a2ee7e5ab799ad36c1dff3
font_02_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 10924 bytes
SHA-256: 5dc2b7453342ee5b6b4effd00e31322fa02aacd1c931f6fbdf19e34267ad7ed7