Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e2d90cfd5fded8…

MALICIOUS

PDF

90.6 KB Created: 2021-07-09 02:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c6f0d390cbd03dfd4dff9ec1dbb5f39f SHA-1: aea08234aa3dddc67ece5ec1f3376d9e09bd3202 SHA-256: 24e2d90cfd5fded8f56faa49e6f93953a34ae1de09a03fa9e15fe7d408b990e6
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/bojojori.pdf In PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4b9ac24ca---fanak.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/fofajarufaseba.pdfIn PDF document text
    • https://360mart.net/uploads/files/nuvifatiselekum.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/50621598600.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9cb3b048069230b0bcd9c7ab10b8f523/bajumotebefoxokutulo.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/zoluvowage.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c6f9ed08a468c78dde2d7f7ecfde6d91/24623994015.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/lemunene.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/wataneniremoresovagafeso.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/kojawefezoxomu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609780bdd2784---78195517264.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8pn16rol7ot8qhifq5vnlo17gj/13153484216.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/nadawesebiwe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c209d459caf---74025230174.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/gesutovu.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tivibapafarirapixer.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7dce673ec---39756619023.pdfIn PDF document text
    • https://starbox.fr/img/files/18546949220.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949fd51aacd---50309838525.pdfIn PDF document text
    • http://pvvc.cz/files/pufazuxem.pdfIn PDF document text
    • https://menu2uplus.com/images/file/83945724788.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b7e4c7b1b9ec3475b13a49f5b0e5aaf7/82079428508.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a3e6285c103dbbf322788f4a723deb33/81777468876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cbse+tenth+previous+year+question+papersPDF 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_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 17384 bytes
SHA-256: d9e28d6d7cb8a955f5bb241394f3531b5c986c0d5a5038b8cff69014579d9770
font_01_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F3 10900 bytes
SHA-256: e540f5429515b5715716faa979b1e17e8d87cdb48d54856fab3876f5b82321d0

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