Malicious PDF — malware analysis report

Static analysis result for SHA-256 d265b023820e558b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 03:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d643a60973023d4526d7b006951d2108 SHA-1: 56b15f77c37a56dab40b1da2ae32061bfbcc3265 SHA-256: d265b023820e558b831d3c69947211b445abe7d48006f5e869f5b36fd9e5608c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting the analysis to the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://weboonline.com/ckfinder/userfiles/files/ditovuresajovugom.pdf In PDF document text
    • http://goldcoil.com/uploadfiles/files/sejinaxe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/63qfm74dfmhgl6kvt44mtavrn8/babosapemunaxi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16142a26c31502---dalituni.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/belum.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/65692259263.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tanopamabujoz.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/kakafuxi.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/24771813732.pdfIn PDF document text
    • http://terrietanaka.com/library/files/49720906894.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/40798750716.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/kidatine.pdfIn PDF document text
    • http://hmed.vn/upload/files/gojijuxovojubajeg.pdfIn PDF document text
    • http://mfahk.com/upload/files/83236065955.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210912_20D81631D6825A48.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1025023e1---nuduzuvirivasonipe.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/5260422497.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/dubumaruvebe.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/supixuko.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/84534586805.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/bededi.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/wezijiduxetili.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614521919417c---tesumekiloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ielts+fever+academic+reading+test+10+answersPDF 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_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 17484 bytes
SHA-256: 629f68bb07c226c93933f990bdf2d3688857df9307c673c0529c27bd68fd07a7
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 10976 bytes
SHA-256: cea32ab40ab8f95d1801b82014920baa9fa8949460b2d5763d39963601496d5d