Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ac0003df6faf32…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 02:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 482fef2625c5f99ef435cdd5a8b62234 SHA-1: e339ed57711eafe9c22e94c3a3df33102e5e3a4d SHA-256: f8ac0003df6faf3255647784f269e697111f29cf2854fb70b4df44fc6d403430
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://rayocazar.com/images/elfinder-1.1/files/file/vusesiwifipanerakolojafu.pdf In PDF document text
    • http://keemunblacktea.cn/uploads/file/081747057739.pdfIn PDF document text
    • http://lachina.cn/upload/file/6098195367.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/gebisegitezufamunateveze.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/18824017197.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morusubegunizir.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/56901139159.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/50993967678.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/zuwezobubij.pdfIn PDF document text
    • http://usateatop.com/_upload/files/71742984228.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/78440239484.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/tokapadexofiselobo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e13db616cbf09a1fc40961bccaea5364/midigotaxazipekemulegavo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131720018875---wisasajamani.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/pexilego.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614702fe9dea8---81812215292.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/somadoxokukisidakudex.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/mujijupokagapapo.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/27849645155.pdfIn PDF document text
    • https://techlan.pl/files/file/36579027431.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/23563628157.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613331f647c3c---98670674883.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/56757722827.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sagedalasarefevifepat.pdfIn PDF document text
    • https://ptogel2.com/contents/files/61097382100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=us+fake+card+generatorPDF 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_off0000d5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10612 bytes
SHA-256: 91364b5712e1624efec552fd8fc5d30e54629551316d5be7a13995fdcfe8deb8
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 18220 bytes
SHA-256: 359ef354ff68a1fde0eac0454b19cde74decfd4e5b3faea67a2d8ea830a2bfcb

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