Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4c3e5728fb737b…

MALICIOUS

PDF

88.7 KB Created: 2021-09-06 04:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2e31e29428c1fca0846c32e20bb6a98 SHA-1: 860e774bc3cab4df81e832cab5d5db9b75d6bde9 SHA-256: cc4c3e5728fb737b7b91b6c357b6369bf467094eb9bcc2ca3c14f270639f8508
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://micsys.in/userfiles/file/12436689411.pdf In PDF document text
    • http://parfumland.sk/upl/18734198080.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/wusuwowunon.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/vezokofusubasosujivi.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xalezuzufusufikinis.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e96f400mdknh8fv582p74mm7oe/laxizav.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160786825196bc---44024053462.pdfIn PDF document text
    • http://texmet.pl/userimages/file/66360507585.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/70155112404.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/kadoxunexatitogeva.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/wezewab.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/502073d1982083ec07639fecce8f2549/93928230094.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nedisobikevizoxew.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/fuvurivekej.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/mikupiratotu.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ebt0ohna89ro4lcr5f0f8l6cj5/49612434694.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ec910bbd6c015f3c93d986449a345ca6/tupilevaj.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/745cb2fdc6b0f031111018e1c68b5185/remuvusorudom.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5ddbbd31695ec50b3a77d5e191f4c681/gagedikalu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f2b428d231ee9db7c6703f48c5ac3922/16861915849.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ded609ed5---46727581700.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/61d0132389a92646fd99b8cd451e84a1/dunilefobumu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/18118484387.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7642eae5289e94af983d82a16c8695c1/genuvotogelikupuzapo.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a60885aac1c62c1e414e8f09cf38f95d/41670534433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cvs+pharmacy+wrist+blood+pressure+monitor+manualPDF 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_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 11316 bytes
SHA-256: 5639e1e3722d355f31ce0ee613c8d76bd63f20acdc419446d839b2e0c22439ff
font_01_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 19836 bytes
SHA-256: b3e550c3e68fc20c80a7eca128db1c210461b9b815768cc42ca8cc70fa7d9af2
font_02_sfnt_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1