Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c9bc9b89e578c2…

MALICIOUS

PDF

107.9 KB Created: 2021-09-21 02:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: de014dd2de535fdefd442899475154e5 SHA-1: 9537f55dca11123d9871fdb3412f1c642e47fb02 SHA-256: 11c9bc9b89e578c2366188fec46e439508aafb518f39edf6b7d19ebec71a19aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the presence of multiple external links and the high risk score point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://lavalnerina.com/userfiles/file/39480657024.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fedekax.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/33213570436.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pc3iall8t1k3k1vn057gql818f/wusudenopamelimoruweta.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/xezes.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa802728e---vomegavukazoxafokumubejer.pdfIn PDF document text
    • http://specialcats.nl/media/files/95602629772.pdfIn PDF document text
    • http://methese.com/upload/files/xobizipefamenubiwezejerep.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/fejitejowugebodinap.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/nadalalekegot.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/gogitiruvekisoko.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fozabekovegenutazapipez.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56856721264.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/21581047933.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/42901200677.pdfIn PDF document text
    • http://midospa.com/upload/files/vabusov.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/navasuxedukejaputuri.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/70012242218.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6319797d4---3705680940.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rameje.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/nazovabonuxu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bcde7f461---53206304185.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/tevamubuv.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/repewadegefar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=nfc+option+in+mobilePDF 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_off0001417e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 10328 bytes
SHA-256: 5938c88b8cd06adacf27cac91c0b0aed03ece7325b761c0ab3145c1b994d6aca
font_01_sfnt_off0001587b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587B 18748 bytes
SHA-256: 897e68d297ecc45908c63c919be56e493d526dbcedac6d0184ebbaa465bdc12e
font_02_sfnt_off000189e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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