Malicious PDF — malware analysis report

Static analysis result for SHA-256 706833af3ef51207…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 07:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0b94764689741a01a1dbdfde2fe2c8b SHA-1: a419b8a3c2666c2fd4fac6a0853d2ddcd1f7a994 SHA-256: 706833af3ef51207c4ff7041edec90a2c2600e7fd60d7b79e0f6681de840e243
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, 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 0.9989

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://xenangheli.vn/public/files/78510892020.pdf
    • http://fogathajtohirek.hu/fckfiles/file/73969147302.pdf
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/66637252449.pdf
    • https://www.institutvzdelavani.cz/files/15123552436.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce4c05219---7165035901.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9636f1528863ad675323bdb88292a502/jovakiwulebito.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9s6dfog16kevf4l6l2nq4gtj2d/63084973715.pdf
    • http://seasonmediagroup.com/pic/file/jemivojunozunisaxizuke.pdf
    • http://asesorgubernamental.com/images/file/nofisopurikazanor.pdf
    • http://ajarnveerapong.com/UserFiles/file/bidixilipitiv.pdf
    • https://daulte.com/ckfinder/userfiles/files/novuzovipulilivipedi.pdf
    • http://notariocprietoa.com/notaria/documentos/files/lujebidakijuvuvibum.pdf
    • https://h1t-url12shio-turbo.com/contents/files/4472989988.pdf
    • http://papaicountrylodge-longstay.com/user_img/files/refabupupuvomemajopobovub.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614638214a6ce---81838087617.pdf
    • http://centrons.com/uploaded/file/28730447614922d42e06f.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tatotubifurabikigos.pdf
    • http://kommunikator.nu/demo/userfiles/file///nalepebojejudujapa.pdf
    • http://flamefitnessstudio.com/cewit/images/file/83449538077.pdf
    • http://dyneco.kr/userData/board/file/1060102541.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+the+new+mutants+full+movie+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
font_01_sfnt_off0001036b.bin
fdc2de7c6895a1cda7371898349af91ea8a217978551357fa1ecac4dc987fe01
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10844 bytes
font_02_sfnt_off00011c51.bin
13bf0870ec2aef77b7798f3fbd1cc6e708f1d333f37af5e8fd35648a734782b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C51 17884 bytes