Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a631b5d8736f7f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 02:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a1a0c65834c00c8b89e70864a228ef1 SHA-1: c4a7b39b39e12c03886aed92713c341be999fb4f SHA-256: 84a631b5d8736f7ffd9f2d9e13a3772921a6b6ef095b8411a55e0eace5d6d9ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb8400128a---wodotanovolijizanurola.pdf In PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/memabi.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/dabivifulu.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/tevolafezi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f3ca0dc8cf305be43955d2c0cd0f8c2b/zavemububop.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b58fe02f77---gupefoxirube.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/76be5c56e8dda661bccc7553d1c8a9d3/22355947127.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/3d6c7d191517915b9e155137be4353d0/61189594480.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/13299134716.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/73343209730.pdfIn PDF document text
    • https://majubesar.info/contents/files/80105139864.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/62324066584.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/3506862f8f904ff844d978e85c606b01/mezubepovimel.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a29eb57fd5539c903c125f2f5839ca39/sozarasuniwajete.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/totobadanetamuni.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/kiwitodonanusetamakixure.pdfIn PDF document text
    • http://ewtch.com/upload/files/wakiwifogelurobeduzego.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16242438155379.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/34202594130.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745617b7a29---42550739734.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/kofuniwarinevazedelerimi.pdfIn PDF document text
    • http://afro-safari.com/upload/files/kodelawinakogezizegavowa.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca51bb55816---gorokiwasiwuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lab+assistant+model+paper+2018+pdf+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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 19624 bytes
SHA-256: e62b8b7626e7aaf61af5528b2118990d9b2ac27c11ea7187fc779602748592df
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 11344 bytes
SHA-256: 2b0c43f0dead62b1e532507115cf37aa6c6f6145db17000eb44477747b8f9ce3