Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b13187a6e95bf8…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 16:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3c927526b423ca32f527d1544dc2b85 SHA-1: c7eaab59572c3e012fa1b283136f2bf047ef1b11 SHA-256: f7b13187a6e95bf81d38912c864c406c038b0ff117fa829c72e2145360125d96
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a link farm on disposable hosting and compromised CMS uploads, likely to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's content is designed to trick users into installing malicious browser extensions or updates, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://csc0516.com/userfiles/file/20210821160323_t8lszd.pdf In PDF document text
    • http://rubensova16.cz/files/file/gemozojosi.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/8633527117.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7f1187bfc04c397b47469a0e390d8e0b/25805062361.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff8d3b865---gokivarajudonevivevebusek.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160acbea644289---751045477.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/81544162489.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d1cnv0vq2sju6crlnlo9t9dak5/67255791799.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dabd43d1f---wudokixutezigodu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/fa5b4d8c48088f16fd9c2ca3d860f111/totapisenoj.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/pasokopa.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210823_FBF8945CA03BA08B.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/47715451085.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/11059226860.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/25312803600.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/caf02246c2152104bedfdd9b8828f003/pixinu.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/97611265118.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/maxewet.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10be01ec3---26949742283.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/42209934246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=changing+default+pdf+viewer+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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 10892 bytes
SHA-256: bee3e3acaab534e1795b55914b50d91c951e66c6817f0874b054afcb487dc88b
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 18788 bytes
SHA-256: 5a66f5c9f9d027f322210645f2852c916167e4d117c1ce221d85bf42f75a3052

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