Malicious PDF — malware analysis report

Static analysis result for SHA-256 10929c368f7d0702…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 01:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e513bbccedfd4aa6cb6837cdd406bb69 SHA-1: ab1f5e5bf0d854b2165fe5504a2e818b4f41700a SHA-256: 10929c368f7d0702e8b6633f2bface138c6b493461c2c0b42325ba81744c6076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=best+anatomy+lectures PDF link annotation
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/uqo70cugkr030qml8u3irf6vsc/98379510435.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4006aed9c---92564868791.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/18684032741.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/lowenudagufenegixi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce850eb5906---26611108135.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcd46c50f8---suxuxikunixokipu.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/puliles.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf761f0bb---folipumidozuso.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/tujimazivapovetavuza.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4d522f60b---90345945277.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1e9a24d2---94212340390.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c14dea80f---wuboputoperosavof.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/575a5eb8e8d809fd89c5cac3543f8c99/namuroxubaxujavugobemutaw.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082889f97925---17647547181.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/78335532527.pdfIn PDF document text
    • http://immopolignano.lu/images/81533689651.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/4955971045.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161055bb13f4f5---8417829264.pdfIn PDF document text
    • https://abeess.com/userfiles/file/9012685978.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/54686797495.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/22320444154.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdfIn PDF document text
    • http://gistys.com/userfiles/file/madetazuse.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/80372544020.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1e5137bb8496739dbab4f47f0dd6ed11/42434839032.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 17408 bytes
SHA-256: 0ed40505fbb8380ee969267b56ae471897a1df0ee26881fc2740f139e719afec
font_01_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 10564 bytes
SHA-256: 4fb2e5da9923c3342562f5dad63c52dcb4a0b1e65f7f71ca22a63d6a778518d3
font_02_sfnt_off000132c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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