Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd32d6e6b2d004a2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 05:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a502e348ffb5de3fff348812cbeacbe7 SHA-1: b2a8b44fb44f69d8e83c1b8e178141b35ab7a05c SHA-256: cd32d6e6b2d004a2f0a4e2cb38fc1a8444c09002195cfd92f374d913f4476f18
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=special+forces+group+2+apk+mod PDF link annotation
    • http://giustizianuova.it/userfiles/file/varogopuf.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/bd337cd74785b7929444d69faa2dd4c0/5826189977.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/kexorabesumizep.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92001cb0e---64018546561.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/junerog.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/21163466698.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/18884540797.pdfIn PDF document text
    • http://erdbau-rauch.at/20702591997.pdfIn PDF document text
    • http://santeh.md/img/files/kuvomob.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48638960306de341b1df020055a1ec81/42810942061.pdfIn PDF document text
    • http://vinmexindia.com/uploads/kufebaloxonun.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/71982179323.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/xoxufo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/dituvaminuloko.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/29478862126.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/vexajoguzisili.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210913060518.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/35321349265.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/badigokisowadezololewubif.pdfIn PDF document text
    • http://ahknchem.com/upload/files/67598732856.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138de4a16d99---gewokomo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75bd50dae---3502491038.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/95371209397.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/pkl1ge524eee9ran4cgnua131b/92637830772.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_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 11148 bytes
SHA-256: b8ffa20c601efdee2308ea84fb6c048da892fe8c7f64085889a12d116ae910f9
font_01_sfnt_off0000e558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16904 bytes
SHA-256: 2145ac864e92f250c52287ddbdd17ddaedfa52677e8c52764e7e9b6d244ded15

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