Malicious PDF — malware analysis report

Static analysis result for SHA-256 345fa5973cc36b87…

MALICIOUS

PDF

87.1 KB Created: 2021-08-16 20:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47fb55bb6df2aa7017b42685dabd97c3 SHA-1: 486cae19518511b03a2eb9c65c774372d866fc65 SHA-256: 345fa5973cc36b87cf28c39173814bf5c1772adcb558fd72e06360285ccaff2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=imagenes+para+unir+puntos+con+numeros+del+1+al+100 PDF link annotation
    • http://provia-events.de/pics/fotos/1/file/76556400517.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7e86cd10---zevobekuz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75f8a3e66a---45148215757.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210527212245_1734373280.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/64737527194.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/fivovaberawuketebegujevu.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/mazugefojutezok.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7dc312a95---83077378070.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/jogov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45c9eae67---9645305827.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/wunopovegunep.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/48750872427.pdfIn PDF document text
    • https://bataretak.com/img/files/file/lajikivaxupoliz.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/nufut.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/fivim.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/28d0f228fb66d7eab69abe88ebfbf188/94522504932.pdfIn PDF document text
    • https://emenu.hu/editor_up/15122294923.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/govazipoketopadozeb.pdfIn PDF document text
    • http://sdds.be/userfiles/file/19212228371.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/86727086282.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/60647989375.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b82dc805a35551fff040822236cc7781/23737861539.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/11333487869.pdfIn PDF document text
    • http://agro-partner.com/Image/files/vozaronopofefopalus.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812db575dc5---79438228532.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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 11084 bytes
SHA-256: f5dcddb97962501919a9a5e98a8baf02aa5647ae9f6de883faef689d6fce8bd6
font_01_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 17312 bytes
SHA-256: 20725a61d7deecf6f801190f43d4157bff281f49607710c1abd40be0c5019a9b
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1