Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd1e4330a006df6…

MALICIOUS

PDF

74.1 KB Created: 2021-09-14 02:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6960086b67f51d18777329c43c80cc5 SHA-1: fcd5b0857d0eca80a955a29678848f04e2e1eaef SHA-256: 9fd1e4330a006df6a6e1e5f84d3fad23f5a84fc53bce58e35e389c8542dab69e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised websites or disposable hosting. This suggests the document is designed to act as a lure, redirecting users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/8f94fb3367ca08e8f973174efc5645df/madekoda.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336d81573c8---durujoridirite.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d64f83778663200605faadf8a336a91/votudan.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/10149444818.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/jazufirudakap.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/74389723740.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/keredubovufedipawek.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d0903f9437152306b650a5a235fdeaf4/bunolufevelamakapor.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210901_1348A69EA69A1E9F.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/19120730240.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/6566620704.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufexamupogasepixafivovaj.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/zefakizakalesodafotoz.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/butakudana.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613345925fb06---fobakixak.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/81899749993.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139c74d84434---bifobiganolisu.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/63010254868.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/zazasinaxidazevowazo.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/jekowinarokol.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/19000149320.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2bb250177---didebutazez.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/27485874294.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/68840447239.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zexinosifavokuv.pdfIn PDF document text
    • https://netlandschool.cl/files/78294845938.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/97852145131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=all+mm2+valuesPDF 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD889 17140 bytes
SHA-256: c84d5e38e0f3370983c791fdd6d8264454065c195f6e34c2363de62dc17f5621
font_02_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 10020 bytes
SHA-256: bf68879c6ee3d93e7c7500fbb40a22823875a7d24995afbbdae03a51d98eae70

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