Malicious PDF — malware analysis report

Static analysis result for SHA-256 f736d3c651fbe2ca…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 09:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 608ccc8058e80b59cf47a8c898816bcf SHA-1: 06450746d9899fbfa3650b9824f00dda6c061cad SHA-256: f736d3c651fbe2cabae22ebb797f3a59f9fecfb54365024401bdf8cea7f15851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the nature of the heuristics strongly suggest the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=ap+physics+1+workbook+teacher+edition+pdf PDF link annotation
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132273017ff1---bumupelusoz.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141257aadd9f---87582398365.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1614075d469bc0---siluzixixexumabazalofexa.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/37448923244.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuvafawowejoxekulajabarir.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/siluxo.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/dixepitipowevix.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/sarap.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6cdcb16d---rasujajisezup.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/wetobevidu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/7rb2sp9lbp2emj73e10gnsf5ha/28323693081.pdfIn PDF document text
    • http://autovoda.ru/upload/files/98181861927.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/91047983166.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/setiduxenojigekugado.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/75348805203.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/97274930433.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/3578897600.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/legakuluraje.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a047ad2218---96859989352.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/87358151536.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/26718813765.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/wumuwiginibifirizagulam.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/23831485542.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/90306000313.pdfIn PDF document text
    • http://vkts.se/userfiles/file/tafuvijamesapazufa.pdfIn PDF document text
    • 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_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 17868 bytes
SHA-256: 18a001bca3b0e62a54e14217988e51353ce5b27815200d30be37f97d8e486d2d
font_01_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 11136 bytes
SHA-256: 6336fa76f17e52b7ef0e45102d9672ff1d56240711c735227d5ef5ce56c52e06

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