Malicious PDF — malware analysis report

Static analysis result for SHA-256 3183e6fc6b0abeae…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 19:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ce75d4687cfdaa5e288603e9f78532f SHA-1: c13467a444d6324f2b25c3ea9fc8aa645de496f9 SHA-256: 3183e6fc6b0abeaee84e7d5b5c3197018d20fdcc189a90a9f73bf243c906f30a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised websites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a pattern of using disposable or compromised hosting for link distribution, a common tactic for phishing or malware delivery. No scripts were extracted, but the document's structure and URL patterns strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/nmi3lu4o9mbglorhg9t9a0jct7/tivebonolakevaba.pdf In PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/fadexuvujinifiga.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/rufizek.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/52669005872.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161091342b98b6---67017901625.pdfIn PDF document text
    • http://chinahongji.com/d/files/tomufutakutedurilirujuzan.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/15e9ebf4621385302a9cd3a54afbff39/juzudevavefifunavawamila.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/zifasododiwuv.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/75370844155.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/jofiz.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/39169846792.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca263b1de2---voremegop.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8ef94e0b---varobarowapokofomiw.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/25995887953.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/vokamazu.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6bf2842e7---xegekofugijuxoz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b4a9ce2e93f49ed2a5c5ad2ad7cc22cd/gebigawuvorojavotut.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/labajom.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damorivuviwawino.pdfIn PDF document text
    • http://amdind.com/userfiles/file/nozisema.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/setududunebanarejevu.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/4042142516.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/v5180rbkrdeisj672787kr6f37/19754947793.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/feranosoborowozuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=electricity+magnetism+and+electromagnetic+theory+pdf+downloadPDF 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_off0000d8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EB 11248 bytes
SHA-256: 32cd962e532b0ce3d18fd8af8e066a96c4a7d5cdb435ad58bb1b9b8af2748546
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 17228 bytes
SHA-256: 104f56733bce03c0fba78135f164f5d3f9fdf1762e42581c41dc7f7422aae6a3
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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