Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95812b7f7265300…

MALICIOUS

PDF

76.5 KB Created: 2021-09-06 23:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8e2930298daeb15b3fb7ba998c2cfc9 SHA-1: 81d2b358c608621a9fe8626430568a9dd5e859a7 SHA-256: a95812b7f72653001762195e69a63d1f668e23bcde876922ff896b8d51832174
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alwaditrading.com/userfiles/files/79140134893.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48202355716.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/71183384220.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0967f57cfb---fudadikanokuwovu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/81354754851.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd8ad3d7a---kanefigosupisijonidukuku.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f2dd7db2b---sibakotixemam.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/lulijakoloxivakan.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/417mh0vhd85hj52pvrssf3sk8k/guparuletitebobevavopi.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/59301551176.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d1b49a84---papipolazifasuge.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/72045443367.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/17557751132.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/nononubele.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/dujusumobuz.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2fefb61007b69b6a509b2db8af44c82d/nokajitejixuzogikibidiwo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b077c207fd5---7855125107.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/0e04a293f3f65ac272ef5590e4c8ae4b/vabef.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/zizogerololororusepo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/jgc6br8fju324frmh5jf59luk6/77202711178.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/veseradak.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa52ee563---wulepipejobiteputepifana.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5e2d660e---vixuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=torsion+testicular+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/korawaderuvag.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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10676 bytes
SHA-256: 5e93605758599cb0d68e8eb73b31e4edae7de972670613a5516f7ced7bd09b34
font_02_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 17784 bytes
SHA-256: a4a59587c215abb0d22d793a9c3f02c8c4e7c799cdb1b35f2c19cab2271b10e9

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