Malicious PDF — malware analysis report

Static analysis result for SHA-256 3944055a1fdcefef…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 01:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00de69976785f73a073ea1871a5333c0 SHA-1: ae4655cd6d6216243e2b5b7e776ec63898db8749 SHA-256: 3944055a1fdcefefed333ca6518a36f96604afb36a825d523187d78ed809f194
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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://bdpq.hungminhits.com/files/uploaded/files/jemal.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/fivalupidopuf.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/dulorufogibaleduzigozisu.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210912040320.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/niged.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/21798434410.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/70122334014.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/113614e53aeea62aad91c1b8bfc806cb/8841505585.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210908121323.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/zebuxelejojezefa.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a04ca8069---38852423832.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/namolekesuxugu.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/99566312376.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/jobanurusunuxi.pdfIn PDF document text
    • http://intertravel.hu/_user/file/jowogi.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/remobabuzajowusadatiw.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/4264255926.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/sutavote.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/tonofidalororug.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109031502079736.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/44221030984.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/85208654287.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ad16230fad6d08812b1c07e42f819221/92375251548.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/kugoxopexixinavutitokataz.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/pixaliwopibebimomanosowe.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/2877241096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=thug+life+cheat+codes+2020+androidPDF 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_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 17908 bytes
SHA-256: b7cf542806f90d61dce83baa31ce3a0d4e2e2d0e2f5bec7ea5a2c58f7bc8a800
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 11060 bytes
SHA-256: 5af7d2181d165143cfbd1309fc3116d1cb2c95d3392b45ddbda717d86a9a3185
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1