Malicious PDF — malware analysis report

Static analysis result for SHA-256 592ab992304e0f6a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-02 10:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 174d27c26f8f891678ad96ff1444eaca SHA-1: 520ed5f63a948ad14f0d1b4b5c418c870241be09 SHA-256: 592ab992304e0f6ac9b861dc5326fbc437413f5f3bf62e54bb6865d0ce55913a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/e73hpk77tl2nkq1tgfrvdj8685/kivefozomiredinurawube.pdf In PDF document text
    • https://konyaalotaksi.com/userfiles/file/1763572614.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/puxitizoteb.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5tkpkd4qfup4d93s7vgojve8jd/notuk.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b3c3deaafc98177ff0d73db48efbf0d/73129820343.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0flins8s7dnm5nk1gsn0kea4st/1314347045.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakipegaraxidifezise.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/bulaworu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fbc2fd9bca6fcca754547a2027a1f27e/peririranozo.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/sakoneferinuf.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c7702df0---11817947293.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/xemawon.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/jimos.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7bc015aa9e2926098aa386a032c70f9a/nigajurukatexus.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210724132556_bj5ggb.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b93e73103f739b5942c45388cacec752/31482820474.pdfIn PDF document text
    • http://air-ned.com/uploads/files/27425462906.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/77329644264.pdfIn PDF document text
    • http://airsoft1.ro/files/file/1137035064.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7438b7ca4c07b4f181692dcdf67fd3f8/mowenafajo.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/jofetado.pdfIn PDF document text
    • https://activepymes.com/pub/file/79036382004.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/30091540275.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b2ef726d2---kewezekik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cemetery+in+tagalogPDF 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_off0000bff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF1 10428 bytes
SHA-256: 88ba2500d9f5121eccdafc12e78d74778fcc8be86251d7aa0e0f1387edacbb0e
font_01_sfnt_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 15664 bytes
SHA-256: b013e406d40600dde2675f766525f04c2143241b0b5bf589befdd891cbcbe374
font_02_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1