Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb0e11f430ebecc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 09:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0960a41c4624d3657a70b7a23bd8344c SHA-1: d9d8a19cafcd5c3fc0034d074ca9e3b195c0b0f7 SHA-256: cfb0e11f430ebeccf4ec637880155a2bd783ba34c1269ad12f0e4dafac349b4a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, suggesting an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://mylodge-naoshima.com/images/blog/file/giladigexavigakixeda.pdf In PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906175002549141.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210905/050639404.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/22739379748.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/16754738326.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/37099971837.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/wigozakimomo.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xomoximotituzipi.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/tikixirumodovoru.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/wufesavizama.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/jakoxuzikonuvezuwulesit.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412985a6e64---fidinonagaditameker.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/20027003386.pdfIn PDF document text
    • http://pinxedien.net/upload/files/kukisutevavakojanodigisij.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b228a5ad20---17881674965.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/42495586211.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/xebitowadaz.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/renuwu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9cf6e35de9955ab884e35dcbb0ee0e49/pefafa.pdfIn PDF document text
    • http://dsagco.com/Upload/file/latozefik.pdfIn PDF document text
    • https://asken.as/bilder/file/58541183432.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/9385468094.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/besopawakukazu.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/98002916255.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/vebokofaxajujozebuzu.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/84289448451.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+bengali+keyboard+on+androidPDF 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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 20928 bytes
SHA-256: 60b836dcf3eb9d2d73ddf104fedc517562fb97add70bd646b91a46a3eac0da16
font_02_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 10676 bytes
SHA-256: 8913f60d619c4e7959fa64fcd9cb0d4b8d5ed4da9b6085d30031e796058b0d7a

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