Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1d5ba6b30537fa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 08:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 21069fea10158fcd6524c08f765b2638 SHA-1: dde1ed418971b17244edb66803ebef6acfe08f50 SHA-256: ad1d5ba6b30537fac86ba1fbe17d4a637bbbf75204a9a5dac5785c74c08ec454
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The presence of these link farms suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://jokerprod.net/userfiles/file/84912737784.pdf In PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/59348381834.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/93384345334.pdfIn PDF document text
    • https://shidoremicrosys.com/media/24407293221.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/870a944eea5084f37d70ead9eea79529/93120873065.pdfIn PDF document text
    • http://dmkert.hu/files/file/83941495693.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wekuvaxogoximelebiw.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/58748707167.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344278586f4---19112997368.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/58408985828.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/21246196344.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/24186646011.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/divarukujir.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/motujosezitigepaxa.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/nemerakiwekanasowirat.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/reninibofaxugevetigin.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210906023427_rvi95l.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/73765791372.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/44873804512.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/24547386485.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/pawumojosesaxude.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/87526231662.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/gokitolav.pdfIn PDF document text
    • https://digireg.gr/upload/foniremobukafa.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/29516162069.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/dokefaxuwamugowitiniduf.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403935c7ccc---75148490870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pixel+gun+3d+mod+menu+latest+versionPDF 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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 11032 bytes
SHA-256: 1166ea1fbbfb45c989f98981d627737facda607fbd5f87630266663285026ee8
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 20676 bytes
SHA-256: 6a15e51561d6bad87a714faa743ecf991001e9831c37c5e4675fab0915b0b803

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