Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1fd2a3ef79a620…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 11:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30350684117715debaa1e344820e4cf1 SHA-1: 953170be323e74f26aa41abba6b1c353ca8ed363 SHA-256: 4e1fd2a3ef79a62058e568d025f5ab04f62c4c84a0bf10369496b515b2f8bbae
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f5adfac2912fb38c8068a6d16e5a9ea5/76855793442.pdf In PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac31583ce4d5474da760a1fecc51f7ac/21630999867.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tevinojezixisuniluvatu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/89017749601.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/komav.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160deb863b14aa---17783380869.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/kokeliwilanevizadez.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/895amsv6g40nhkreplhhepbpn4/55078254100.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/5809098117.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pusaxadigite.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/s3rgjcqhkd5sr3m6r4rr8c6nji/55576627439.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/12758767784.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/kojasajaf.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/39204666718.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/93035443516.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/32036053978.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/5844456763.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/47118209522.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/fiviwuvilozal.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/63334497354.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/nobas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=easy+book+to+learn+english+pdfPDF 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_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 18992 bytes
SHA-256: f92e85845100bea5d65dec211a6c5df533c41cabe5e5d24c8170b00e310667f3
font_01_sfnt_off0001398d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 11108 bytes
SHA-256: a086b2a0deef3b708dc2ab9feb0c66aab682c571e87a98eb5c8b762b7c1520a9
font_02_sfnt_off00015302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1