Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bcf46a30d5354e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-07 21:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb2361656d1cd0eb12427bc6665f99a2 SHA-1: 669eaab67d0edd2c817fab7dd1042ba834e0bdc3 SHA-256: 15bcf46a30d5354e66c8c21b88330d797aab8f70617668843e613c8b7e1228d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea9eba2b47---8130153422.pdf In PDF document text
    • http://beiks.info/public/file/77198376617.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mvp0r5g82r0ul40vg404mrv8m2/36062424859.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/velugositamiwenudojetidef.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/42370532965.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607322f1d1233---surime.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/44492602926.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/33654085309.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b235195d7b2---jizibutawu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/26775315331.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160917e05388ba---88855981438.pdfIn PDF document text
    • http://clubcrudupsonoma.com/clients/1/14/14cf715f5cd05ddba197ceaa5938d7d5/File/lubavuzoxe.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/megumomasuwapawuf.pdfIn PDF document text
    • http://teraval.cz/res/file/difokijawaxexifafasebasa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7152809b2c---liwokagokomokobifinid.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/sukudilafakexato.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a29e3e6a63ed981a91dee48123e81275/86254149771.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/fotozobipus.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef96f2e2c---gilerevolakevefot.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/vamejozafijoregebaluni.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d2c9c2871---65082594999.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/9052866424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fiber+optic+sensors+book+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_off0000b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB873 15444 bytes
SHA-256: ba511b0b7cb9901c1570a336febe3d10885c529c412f80e0dc8b929f46627453
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10616 bytes
SHA-256: 7992b9f4aa1f990ef8bb18de290da60b4abedcb8c1b38b90dc62b1f274fe1ee3
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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