Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c982dc67ad942f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 13:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edfe3594df6b8f2294a50c9e4c206297 SHA-1: d483e4a41256d3ff6d53d4829a5f45f9c18a1b99 SHA-256: 20c982dc67ad942f77a14ad7afef967c7e43c8dd08cc3868c20a9396339d35c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple external and compromised links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=how+stomach+ulcers+are+formed PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f82738e5e---95744073414.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a194714c52f---gosaluzonibeliweviki.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/fesumuguzefi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/36838632452.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/1ee90177b8a4b3cd979864413221a419/69283189654.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904ff0da6f7---77231373408.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/nalawolijoxukixizaxewarab.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/venesebanejomuwuvil.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/arb54naq7npsv1g4a6pla3o7ub/616981817.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfa9b24e05---73424008074.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/kiwifoj.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/63106695794.pdfIn PDF document text
    • http://atomleasing.ru/media/File/tabalobat.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/begowiwomedolikosunegup.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/namamekofiweb.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608002425121f---84269051403.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/nr8lup5a86s41d6qskq50bj46s/lexanivelumexerovetifiwo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80b6d8c74---tuwubineruledevujimibosik.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b31097b92b7---mogokekutadebiga.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/a2a7d80373f45f37eaeab226712058a8/3849586183.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1ne5btd08tuj97rc429coa3g8l/31474910461.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/492129066.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d5d2e44c---67217065332.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608367e53ee9d---zupokewufanufi.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/72381177249.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb2a596eec---jejogilodaropebikesibuge.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ca8b661ec---tawefusuk.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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 10720 bytes
SHA-256: a354467257e700954ea3e3baa2d43b4f067e8b4adcc7c7110a416afc44b9d437
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 17564 bytes
SHA-256: 5ee39a20cd3008487aba699708fe609bd6a2bd479ed1f649793607b6f6c962ef
font_02_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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