Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa9dfdbc8b25666…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 17:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fa5deccd409e24bbcae7197f8ee5be35 SHA-1: b35ab5d5d976ba318886d002f2075604592b8388 SHA-256: 0fa9dfdbc8b256661b3ccc3b47150410ff70aa249015637933a69d5286cf5d34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URLs. The heuristics indicate that these URLs are part of a link farm, with some pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://oniceh.ru/uplcv?utm_term=visual+thinking+for+design+pdf PDF link annotation
    • http://pro-customer.de/userfiles/file/bivijoxokawu.pdfIn PDF document text
    • https://congchung7.com/upload/file/wirapamubul.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/nasemalesiwuxuwigule.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/wifepawe.pdfIn PDF document text
    • http://inistor.com/ufiles/files/18693166328.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8e62ff4487af0d868b60f119fa185524/bedunawinir.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/mirelizuwivefudod.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/24147647605.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/wawanuvasajabepaduzalador.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/rq8pa1qh2n679k33lojaq792n5/lugipepuladevaniv.pdfIn PDF document text
    • https://ismart99.net/upload/files/munuzag.pdfIn PDF document text
    • http://wwstationery.com/files/file/kesux.pdfIn PDF document text
    • http://apex-architect.ru/images/file/radumulukujuwaledus.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd988145ac---mijemasevefex.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/4162813291.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/70937575086.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/derid.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/jobagegonukabuj.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fodewaduvetolukabebiloki.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/dukibowo.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/51672167785.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/3698694949.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f729ac682---vokasuz.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/27369543885.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_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 10936 bytes
SHA-256: 337c15c403ce9119bb59d00a696df2479f218adced150e42a31ef397b711b8d5
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 17060 bytes
SHA-256: 9380d0c203308c919799dbcd93a7ab7efc9ad0167a746b467b50925a35e72ca7
font_02_sfnt_off00013a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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