Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce5c8fb14c94a38…

MALICIOUS

PDF

89.6 KB Created: 2021-07-01 00:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 44ebd129a7c1471e954dd978ea578c3d SHA-1: 86c1b2f905c9d791a8b0776faa7384c7517c2c86 SHA-256: 8ce5c8fb14c94a38a47ec40c9f3101ddec0119c08536987c478a141026179b45
156 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. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's purpose is to redirect users to external sites, potentially for phishing or SEO manipulation. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://huntic.ru/uplcv?utm_term=introduction+to+the+thermodynamics+of+materials+5th+edition+gaskell+pdf PDF link annotation
    • http://digitalpolicycouncil.com/imagenes/file/nusodotesada.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d57048dc9d25296a012a5c70187b9c17/41853758001.pdfIn PDF document text
    • http://stroi-sistema.ru/img/89675587723.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/615bddb0ff4780e4cceb4dd5df9d5591/86342281454.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cdc6bf982eea29edd154b92cef9cebba/35578945477.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fh8jfnar0n6m6i9s08t473im14/niridikome.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608317efdd407---kabazuxezofaxizi.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/18131701239.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/8c08m26nhd202lc6dfl6qaeme0/15601988005.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/j56aou62eppb8k3moq0anokei4/54833374.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/natewo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/13154021472.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/tewili.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kixejepodotomanomopo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/sjcgicv28nar00lp6ka12b4k1b/ruzejajifokamagifem.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/vf5qbt6vo8r2s5qah03cejrin6/62040819395.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e4ab52e---30858345937.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/22569486883.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/waxigoj.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/47954974934.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 11456 bytes
SHA-256: c8125f39f5a652a4813cedf6852e2356859b26dff7cf38c9da751d46a7a6e02f
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 16904 bytes
SHA-256: 842f3e3e9e00f045fb1bf21b028d3a7ba170b47e19847a5c400b56f6b9acda29
font_02_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CBC 2736 bytes
SHA-256: d3f140d55d47b4951a096248f08d9b725d1d961f7527e52104112896c8fb7554

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