Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc44fdcdf959d37c…

MALICIOUS

PDF

75.9 KB Created: 2021-06-28 01:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ebc26197c97bb8fb15b5c601f1b7055 SHA-1: 358ced78b47c1fac8c57ce38defade1529fab183 SHA-256: bc44fdcdf959d37c45dcf7c59b4f89096baa45dcfd139ba64d3efed3d4153e7d
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 functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for phishing content or further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608084b78dfd6---10417431474.pdf In PDF document text
    • http://bundoreh.com/fckeditor/files/file/zafosanarenolebaxabut.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609341c9418c1---16897489439.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vokezunumojapivojeduk.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/68e6umko3l6hph6cvhpi6a1s00/21393675798.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011237046150.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/dkeek6a96rm6f1qukjkub2vuuk/24528848577.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7818c477d---basuzadifexuvino.pdfIn PDF document text
    • https://area5srl.it/file/jokebalajilib.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/db1d96887f601aa04c6dad446e0a3cd2/82235352190.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b853c0ac1a---surolojegipojokevides.pdfIn PDF document text
    • http://mobilieroccasion.fr/uploads/file/kofajegevefufibiwejigogop.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hcm32ic2avvotlb08ijphkjkji/53013297845.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092280ac2374---kifekitozunapakukoz.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c7733b417cd---saludakagomefutozojifu.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051814013388.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zudawekap.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ibh0sarqvmrm91i6hcr67jgig5/67967319555.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442456d5be---936449760.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e7b64feb---bisebex.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/918de5200bab770e16a511daf0f51af3/78826088152.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef229e876---12097496324.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/vegenevefezapazapovese.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fe7f93ae29c1cf6d5e98fbd187b23de5/bovivikokefumimasesubibad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=a+journal+of+the+plague+year+answer+keyPDF 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_off0000c45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 11048 bytes
SHA-256: e4877d3caba07b9d9ceb3246c1f6f1d4a33dbbd88fd160e0b6f41c69005a9549
font_02_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 17120 bytes
SHA-256: 5b8cc9cbe85d82a1c5a8ac23b2a4a7d7c3c323975b98378e4f39214125b739ab