Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f70de6d82bc09ad…

MALICIOUS

PDF

83.3 KB Created: 2021-09-08 00:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 16eca199f8677a9a7de45d6c3cdfc8cf SHA-1: 71e8cb6a051f466b746e2d536e9e541e50ff7ac2 SHA-256: 1f70de6d82bc09ad6b1512067b2b7320b9549cc756ba9947a28d504302db9c1d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF acts as a link farm, pointing to numerous compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=much+ado+about+nothing+pdf+act+4+scene+1 PDF link annotation
    • http://mengnuanua.com/app/webroot/files/files/xajamevazosifoleji.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/160b9fde963ccdef84e8c4808d1dfffd/buwuxexikuwupike.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/golopulupupadovajiraxevo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6a41f360---70502890038.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/44733012691.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/pulemedubejisanokopun.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/mamuri.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qiv60otoitd1aecari1tunb0j6/xagovi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/15879542431.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1200b07e---89141203172.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31228f1dd---70452960666.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/1260298776.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/liselonajigitovuguselo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/79ee8f821561fb556634d170ca2a7524/kalawemaditegibilugezixe.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zegiribenojexeba.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/56456032855.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160865122abcfe---majezi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1enopo5hmhu6e6qk1rjs018foa/ditisuwikesanunog.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/83690883590.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/17986894168.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc3405c174---60792818432.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0e6e9381---94763660494.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/7485981830.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/78395645697.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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 18592 bytes
SHA-256: c1a156fb560d217c2b3734a28eab55f2ed1fc9c9bf17071cd7b14eab790808bb
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 11116 bytes
SHA-256: 4a39f554311a972b525f4d7727b3de6c752ddbf4d3d1262f660cb86aeca43e6d
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1