Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ffc751238ce9cd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-05 14:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bc24849ef3ef6a3e588684291577e0a7 SHA-1: 87f703715ebbd38d335acf26a8332c9df82a3f75 SHA-256: 03ffc751238ce9cd33ee05638ae97d1d06e9d161f81a48ed7e1e0d64b66d7aa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to potentially compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or visiting phishing sites. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/fcfc7803070f371e66d2338e36f2169a/6292737743.pdf In PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/serowuvodot.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a5780a0263daa615d0e7ffc88f72d81a/58179874307.pdfIn PDF document text
    • http://concept-art.nl/app/webroot/files/userfiles/files/49956447708.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/xokamumexonesonorukeb.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12308734364.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/zaravasunegenefowumivi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0jdddih0kd6hlncm2llgrllsl6/23157054800.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210730_045654.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/aab78a9f72137b4d8d2fc0ea6c68e076/dabedazofesuviziwavevure.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/direxunoworejezugafefuw.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/86650592936.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/46913751075.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902e037eef9---kinesedinivalubaromoduraw.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/piripigides.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b754a040195---vivedawefovuwuxelajipa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b563f163f3---pujusutijabogapitebi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077f83cbe725---731742063.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c607b0a71c6cbb158abf090f1c52c34a/42487695723.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/5600250113.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e9619fc50e3eecf15ea580157b5e40b7/nikes.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/895378354897751b5677127cfeef8e9c/tenasorurar.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021082115074273499.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b87353d9e43---tokoboxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lightning+arrester+pdf+free+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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 18968 bytes
SHA-256: e91365426705a15b79f089bbbfa0b1205e3c6db4e54563c4c396c028b93b24ba
font_01_sfnt_off00011b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 10820 bytes
SHA-256: 7dbfd0acedc8c94d9a1a4730641fb91b53dc9e3c7774327d6547457a987d17fc
font_02_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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