Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33ce52d32534033…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 20:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5995f23504b09ea4e02bf3fa9eab8478 SHA-1: 957af0aadf3b33559816bc39bc8190f632005d75 SHA-256: f33ce52d32534033ff1441be146addc4308188c019a464bbd651a8d6ed113f9b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript, indicating a potential for malicious execution. It also functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS uploads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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 http://yuli-china.ru/d/files/gemededamelumidek.pdf In PDF document text
    • https://immobiliareincentro.it/allegati/file/xujuzedufinisirususe.pdfIn PDF document text
    • https://finliz.lt/i/File/34512528322.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a31f5ef4b8---valurupugulir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a698d61db2---mugeniv.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/70766728767.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/43c4138ufb84qfh5trorhkuums/fakimuwubinevotori.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/refev.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/zokopojatolinuduxejutitu.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/41100163817.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/sabuxux.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/22609381258.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/64071267885.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146ff54c167d---27278331655.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/81054252414.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/69263692903.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/pekizawawezukuvi.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/defezokazitok.pdfIn PDF document text
    • http://dalaichau.com/files/46629319347.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109070517323797.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/14579459346.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zonalobowube.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613363fa48a2d---83390264863.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/59114343277.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/29422310480.pdfIn PDF document text
    • http://xn--12cf1djdb6cbcafdbu1f1cudgcc8am4wf7htgd9de.com/ckfinder/images/files/resunapap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+bride+of+habaek+episode+1+dramacoolPDF 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 10928 bytes
SHA-256: 1d3c100b55f87b101e1f1708a7ae2273e04f3ef73bd26b91eabf7a9ebb005a22
font_01_sfnt_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 14988 bytes
SHA-256: 07765f581195b7bbcba86686792390879ad498810dd192b79dd8dcf7818631f2

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