Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca5ef1c73937b9a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 09:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66a110107fb3eac564c0ae18e605b887 SHA-1: c60db9b2e365d9dafa6e25dcf7bcd95c18be416e SHA-256: 5ca5ef1c73937b9ae6a4ddd5c902b59b92a510497dd446bdd0d733d63435385b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://crewmak.ru/uplcv?utm_term=cpa+australia+past+exam+papers+pdf PDF link annotation
    • https://osikovo.eu/webroot/img/content/files/nuwonasutebijedere.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/fafitezixizuzumixigowiku.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b1e8b09c0---poreb.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c612d5454327643e2cce4da570a2f9f0/fiwokurojuxinesa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083525b3d7ce---xuduwusekokoruruxexup.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/gejufumizijozop.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/vimfe4b7ujvtbs9fqdq8mg4r1m/23532381755.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a192abf1---fazuwuwot.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be929c2a45---wiregevi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nafox.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/balodeb.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/rofebibifibela.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/17407670333.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a5a3424ec---55547552826.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9163b3904---lexuremobipuxukodoxitoxol.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/52699252060.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5195ec054d9c6452a1aa5faaaf1bef04/23268318083.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/sizefanebawudawepone.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/85326510641.pdfIn PDF document text
    • http://4darchitecture.org/img/all/58289726747.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121b1bc20c8d---53103222789.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 18512 bytes
SHA-256: f1382e4c1f352c901f22865fa1d8137feaba329b68d342b0031acd61cf62bc84
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 10668 bytes
SHA-256: c1f5af1b5c3be9c41397d715d87d171cd2ca883593ba0fa09ea8f365430938ad

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