Malicious PDF — malware analysis report

Static analysis result for SHA-256 324721bcebac0f7d…

MALICIOUS

PDF

99.9 KB Created: 2021-09-16 03:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 744bcdd57c2db1db8b3227ca33d36772 SHA-1: 6005334b7c48b7c56e895fa7ac57c7a9150451df SHA-256: 324721bcebac0f7db0568aab3fc4c138f92d0249186daa4e9d1a23a77275aa53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The PDF also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the ultimate destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=all+fairy+tail+guild+masters PDF link annotation
    • https://chinese-wall.tw/upload/files/92278537648.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gorejefaraguwakejiw.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/92192876849.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/4052455300.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/fedibaliko.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/83888811466.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314a57cae40---34982547543.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/bivadojobemifivikeza.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/lixiguzo.pdfIn PDF document text
    • http://katela.net/userData/board/file/75494022655.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/67313652322.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/76487311317.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/29856124282.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/63919781678.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/46857067798.pdfIn PDF document text
    • http://saktigroup.in/uploads/29775016269.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/sadosaverefi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b93c082e9---45292093580.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/nubefawikuwikazisaxatewo.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zigewozinokakum.pdfIn PDF document text
    • https://suksesunited.com/contents/files/pipitojizipiroruso.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/97638451128.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/40896bcd1e14d7f4915441b401994bd1/lipabibumomudubusid.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f9c7257a1---kebududivut.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef25a30b7---jedonekuzebadatalomu.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_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 23540 bytes
SHA-256: 795ee9df23be279033e21977ad266d06b269dd58ffa026d5f390df48114dd222
font_02_sfnt_off0001697b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697B 10668 bytes
SHA-256: 4ff8c3950da9e1a422e88bdc9f0943107d823a7aefc9ac43dd92025f852e53d0

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