Malicious PDF — malware analysis report

Static analysis result for SHA-256 428a037ef5157109…

MALICIOUS

PDF

83.2 KB Created: 2021-07-30 08:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8eca6fb160a6ef398fdba54d12bffd71 SHA-1: 706124c930cdb672ee750541a7f3eb87a771841b SHA-256: 428a037ef515710972479ba3435c6987b1a9947606d8705cf04747d19053898a
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript and the high number of external links, including one pointing to a raw IP address, strongly suggest a malicious intent to redirect users to potentially harmful content or download additional malware. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7489

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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 http://huucodatlanh.com/userfiles/file/27122534070.pdf In PDF document text
    • https://binhvi.com/upload/files/44326275229.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/13677902bb68814f40010384daa2c84e/31849323717.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4q6o30tg1ujtlrlipi525ihisd/69209567005.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/85830656473.pdfIn PDF document text
    • https://latework.cz/soubory/gafitaxezowiruwak.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vs757u6cc6nua9def3cpcbmq7r/73853380770.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/24577685892.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a46f0c34---46547286097.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/pofedoramokurilozuna.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/65742258925.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2dhcbpht130foq4tqfo75uvpa5/78458562112.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/f28a18dc4e74ac9a343bd44da33798fe/26571587114.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/vorox.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kchgjdbdhncg3rsfs9kdo04uk9/togutupejitivexupokazi.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/cee32e3cc93e352fbcb36fc0de7706a8/rowokalexok.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2959a10274af2b700e48c414bd06de5c/wenafobo.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/80956477189.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fgv5ab07h72m4g2e5i9nqgaken/4431404868.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/10857481027.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab2deebd7---34044797716.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/lubovajubesubepidil.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/zojamuluzavugidos.pdfPDF link annotation
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/6d0d66a8b489f075c6d65d4103315a96/52857771899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=simulation+ionic+and+covalent+bonding+answer+keyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 17704 bytes
SHA-256: c785ac9d8e2ba830f1fc9c10f211391b45faec29a36b8e61f7420bfcbe44daa8