Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95db85428316b1c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 02:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6fc0c06b70e1567e1bad12c89322bf2 SHA-1: 1aa42fc1de7778144be3c0f84835eb96218deeba SHA-256: c95db85428316b1cd2dd7805fd279cf0e2b53e2e481b4d61448fa20281df6546
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, including one identified as a compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://premiersuli.hu/files/files/xutoxo.pdf In PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/65889483763.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/ziribivarepadad.pdfIn PDF document text
    • http://huiking.cn/uploads/file/091315138217.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/97221217492.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/zivufutelokajajez.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59320491869.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/tifotizesazodiluvaz.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/sejamu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zupebikoselegapidor.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338ed9458f2---kinananejepasuxurowijata.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161423fd88abbd---1695932133.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614042e221b57---63389990527.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/rudud.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613230a369cd0---zakewefekenelumupaxuvu.pdfIn PDF document text
    • http://quinta.cl/upload/files/52604058810.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/23908605334.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/xurifefifodutafomel.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/18450957921.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/topatasok.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/dudirudube.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/katodamizimozid.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/vimafoxidarunirimepijafad.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f3d44efc---20453712852.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/38828870991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=my+talking+tom+2+unlimited+coins+and+starsPDF link annotation
    • 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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 18656 bytes
SHA-256: 309d824470c090298d05f3c5aa17e5fbe5ff8e6cf8b6080b3f734cb391a5b025
font_01_sfnt_off000112a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A4 11132 bytes
SHA-256: f40aacae1b0058065525a6143e5507f154b0da720fbeb11dc4ee070029a91bdf
font_02_sfnt_off00012c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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