Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcadfc0058259ae…

MALICIOUS

PDF

82.9 KB Created: 2021-10-07 17:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ffb413b2dbbbb279140014ee18a03f0c SHA-1: 9757532593fa814860d76b4b4ca96fb2da3ee641 SHA-256: 8dcadfc0058259ae4eb3be031f010fb051e7ee629336193e7682e8aadcf71e75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to potentially malicious sites, likely for phishing or malware distribution, leveraging the embedded JavaScript to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=best+pdf+to+jpg+converter+android+app PDF link annotation
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/selanegejelu.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/42285595246.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/nizusimig.pdfIn PDF document text
    • https://costarica4d.com/contents/files/72628180908.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/42ddd602a33eec5b804388c1fb4a22fb/zetaravijidakorodafimor.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b496d3ebc---tusilisedo.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/96267707079.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/59699144274.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de55bf3e6f---54174607335.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/fuzikifobukodamom.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/89853342245.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/lolirule.pdfIn PDF document text
    • http://mimpidia.com/contents/files/buboze.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75605210215.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/wubatijiwu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/1906437743.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/biwokonuzovevinexojakeg.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/vixigupubizigokegeg.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137a70168e12---kikorudosogiwenubakejo.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/12220904080.pdfIn PDF document text
    • http://chinalabware.es/d/files/wodadijuv.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/kiniludet.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/fugetirofolesebevujudabo.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/2710273580.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/72017460457.pdfIn PDF document text
    • http://capri.lt/userfiles/files/69318945131.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_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 11000 bytes
SHA-256: 3e43e4ac40f3591d8a55795bff2cfe25c9c8d35cc253958ca2bf7537511d6e20
font_02_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 18460 bytes
SHA-256: 4724a7f37c3609f3d9dcc80d318e1831d87f233427dafb4e673c9f308186f767

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