Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac79e3584cea634…

MALICIOUS

PDF

90.8 KB Created: 2021-08-10 06:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe20871453c92789efb05fa69ab8715a SHA-1: f11789a852c4a7470d29e698f873a53bbdbf1c94 SHA-256: 3ac79e3584cea634a0cd6cb4f55394a20f57650deb974362f98672d8e08e0c10
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains an embedded JavaScript stream and a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic and the numerous links to PDF files hosted on various domains strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ed1eda6ef4a173bc10b7308c0d5ee8ae/37652746414.pdf In PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/21917308616.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ce4277ad7df03f3331841870ccfb6442/25601605706.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b1166c34f301fec924d6a93eeba66edb/wavuruneboriwiselikofoxi.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/kugujaxika.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bb3e74ae15cfaa38f896c28f1ac93b1/91000410372.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/5355660150.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/korezinuvurotukawabon.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fc90f106---77594556839.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da787a0db322ec5d7243765f3ba4b550/10245667402.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/list4ta74m98p2bnlae018l1o7/24096312239.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b4h35a0jnqjl5o2bnrs10s3e4d/tolirusalukefoben.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/sigisifu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f76b942c---86920314825.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/73ed1c1b52e2a4246f8827d48be6c078/fabavomasikuxelegibotaxev.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/walulifaku.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8be66a85807a436b8489928839694030/xipamavod.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/99547330012.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/jipupilevozasil.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hcijk87njfa169f9d42holehme/8480267103.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607051b2521d1---58710888478.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f39912cc1a04b5a5c498cf4b12cf72f/satowunijagivorikelunuket.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843fb82dc30---26762968730.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f2f314ff73023abe41995e1739b17dad/senusibadiditolagu.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6a9624070509d890298b9fef5e8e430f/ditutiwitex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+connect+wireless+mouse+to+computer+without+receiverPDF 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_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11731 16732 bytes
SHA-256: f01e3ccb5466b065e39b1a5309bd66e7c006e6afdcfaa23b6edc56ef2f74c5f9
font_02_sfnt_off00014321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14321 10720 bytes
SHA-256: fea6c6ae06377b67b8eaf15a51e2b209d576be335b72efb3ddd42df53dff69a8

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