Malicious PDF — malware analysis report

Static analysis result for SHA-256 5133f1494330a28d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 01:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6370aa28879f13ad43f2498b3ceea4c2 SHA-1: 586a0127151b15cd0a63719c31055f89bd138520 SHA-256: 5133f1494330a28df9e61c43de3d8d8367ca67ee2fb1372c6321bddf03e44fb1
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of multiple compromised links and the link farm structure points to a malicious intent, likely for SEO manipulation or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f8ba276a606dd5e971c02307d2c9b211/jebakimigarow.pdf In PDF document text
    • https://galedo.cz/www/data/cms_files/files/90685436492.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/vajax.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/61100979856.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///tolijonuriw.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/nukofesepepamokunew.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0ef93fc3c---4054632366.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163072064649149731293.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hu7ube10pl4rcr1oamqf7mcqud/jubilagimufozu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919055d7c2d---77048045080.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb183533e2---79595560164.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c709aa72544---58684385106.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rtg4skcvd2q49jgnt51m4q550p/kikuxanalorinatesavobuk.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2b7517bd8---pirirefemedibubigovel.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/22676653dc7c5a8747fe0f74026f70a3/81057112478.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707703ad397---10167901535.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/72725911282.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cdc5302eb---jasojera.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/kezijedidaza.pdfIn PDF document text
    • http://odumakus.com/uploads/files/64355823768.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2jfgc3i9mtqdn8ggh3hd3jgrqu/73990316826.pdfIn PDF document text
    • https://arerp.kr/data/file///jufatosirijidopajijebe.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076837eb722a---pakesoparijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=khassida+transcrit+en+francais+pdfPDF 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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 20588 bytes
SHA-256: e7c396d761ccb05937b6fd32e774a60eaabc55492f46b5d14ad49677ad4aeed1
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 10540 bytes
SHA-256: 6840e3bcceb631ae018882b481dfd6bdd9685d1b69d67a14a51547134bdf9629

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