Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a98823484c533b0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 12:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5adcb1f7998be089c16cbbc82f7cb16a SHA-1: baf47fb4ae91bf22d760918de6b795e3ba87c8e9 SHA-256: 2a98823484c533b093fee4872757842dce32afed5f6c22770100de9d800ed873
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it contains a link farm pointing to compromised WordPress sites, and one URL is associated with a payment redirection lure, suggesting an attempt to trick users into changing financial instructions. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the nature of the heuristics strongly suggest the file is designed to lead the user to malicious content, likely for credential harvesting or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://catamma.ru/uplcv?utm_term=pmsby+form+sbi+pdf PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f7601c8f---1569367778.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/28663bae2de20602dbd9af69366eb667/wijilosi.pdfIn PDF document text
    • http://samtekelektrik.com/files/lidimisabibazu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e051b3e42b0f78e7e752fda216dbc313/59186282721.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/vimofumalovur.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/h39n5p240umnrqudc72doql7kh/metel.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8a094c58f---70358034172.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609405d02ac55---44746216451.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/dunikabovobeza.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/87184973768.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d359146a---xadikekuzobosepuwaguduru.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/xerebokeje.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/relovimitipi.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zewugogipozimuravukiluwe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b72e7f619f5419d9814d39de1ea1f631/vefigepokovaro.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/bb5e6d0997dc8abf373ba17d3b11cfd3/pinaxopavipiruzinefewum.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/bogedav.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161191464e3b6e---43184589683.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e11a480c3bbb799735849e016f24935d/zogunidawasavalejuma.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/vebomujufiso.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/larojatelitetiragimed.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/dovewugutomebufajiredoze.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a66da87987d---ralorumetabukometapix.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2dc07e9b0776c290ced250d38709bc8e/lavifudimiwalemug.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6a886048628761ee989a334387b9d7e1/lenapaxu.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_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 17420 bytes
SHA-256: b88575c944f8bab0d21fd939d87404ca3925bf91e061da6369b678736fa0516b
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10372 bytes
SHA-256: 952f21e9bde3c227116f6d5fa22091b28446ae10b30215ea00234c1f03f5dbe7
font_02_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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