Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8878513c0eb5cd2…

MALICIOUS

PDF

87.6 KB Created: 2021-07-05 02:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c408e1bffe23674bbd47deaf88c94e4 SHA-1: cf7285fc8ebd8e0109c5402577e3667ff6812c0a SHA-256: c8878513c0eb5cd2f70a06f023b108001f66c90e6af87b07e15ab6fb7bdfd7bc
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it's designed to trick users into downloading further malicious content. The 'SE_CLICKFIX' heuristic indicates social engineering tactics to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://beloezoloto.ru/userfiles/file/dagipubelara.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a641f20f4db---dodokasesajejixu.pdf
    • http://turagent007.ru/userfiles/file/subojexobovamirematolovat.pdf
    • http://nowyhotelik.pl/userfiles/file/53062959725.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/93205530642.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cb9ca139f17b99bd409bd12c9b2c709d/dokokukereker.pdf
    • http://englandmatchshirts.com/assets/file/divivuponeralu.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/13481684381.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/73389231495.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4b8b606cd424b547c51198d3aced8a66/lotunuzitar.pdf
    • http://everbeenmagnet.com/js/upfiles/files/tadalixitexilokeze.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/muranesisozedonemipek.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eaf6698bf65f376f3a31482a96d93aa6/dosofipuwaretu.pdf
    • http://c2ctrading.org/cms_upload/files/biralipinusarome.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ced457cb2b2a89b08883b31f4786f8ca/74532427076.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106211352119643.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9e54e2f63806ee637b33c7955a9baefd/1620049055.pdf
    • https://combrooncom.com/contents//files/15496166989.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5234a2aff0512bd306d083b1ae92398a/21837180756.pdf
    • http://leebyunghun.org/new/upload/board/files/76417441793.pdf
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/71597619623.pdf
    • http://skrabl.pl/www/rpbd/fck/file/80657476458.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ce8a8a72efcae6b11bf6a9ada6c84bf3/24545673854.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ad5da6e43---revegubelaxulukor.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c601c7397---37886405475.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+open+custom+maps+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f279.bin
ba7cd8bfa0d4cc29947a4c2261922fb96e5eba96f3529c61d6e0c2f054b675bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 16860 bytes
font_01_sfnt_off00011e7a.bin
63949260dce79e5bf5ab6014ebabf383e193cea09b7af08613ef8b4b49a52ae7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7A 10772 bytes
font_02_sfnt_off00013754.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13754 16792 bytes