Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d6a673aa084522…

MALICIOUS

PDF

84.3 KB Created: 2021-08-16 12:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c879541b637927cc6012b3769981a66 SHA-1: acdb8c4d757fb911add2f6267ec6043228902941 SHA-256: d8d6a673aa084522964e8b416d0e28392cbeb71685d5c0c8ce5bcf513eec1644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://krisoc.ru/uplcv?utm_term=materiales+zany+cuarto+grado+bloque+1+ciencias+naturales PDF link annotation
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/4315079184.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/lerajafukutalibemuwawop.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/62784717664.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/20438027526.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fbfe6ec3---regakexutadeto.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/527b6c01091dc2f5e5ad0e346fb92af0/sokofenikalaruvamoner.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b899689d2c3---17048750316.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e55b2772---74618886809.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/42793461180.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/sanunafepisa.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fbd849fc8ad3bbd78cd3c88ea245bb47/47898758594.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/04d86348af90e03c652208a323fa1c09/dolonoxufodutep.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a869d1e6---78615407275.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/47954299977.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b6dac13c38a---31730445198.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/q1icnjfqnv0c2eqvok28flbemh/felek.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/tidalujezun.pdfIn PDF document text
    • https://badoza.net/userfiles/file/xunikolive.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ca5a94d6---72045020907.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/rizafif.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6161650721---98149279549.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/wosewufopivil.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/tnej3bbj8mve8b7rcmobsok7cl/28462471084.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6939b38933e8ac860d085b018f389df6/vififigodewotonubaxe.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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 20252 bytes
SHA-256: d6039a4d5e2241b59a0b677e95a3696cab7ae978837ef8602f844e4bf69c030d
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 11148 bytes
SHA-256: 16e88e95adc3f2e052729f51269e2f4f2314ccff90c28e318ef8fac71ea629a1
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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