Malicious PDF — malware analysis report

Static analysis result for SHA-256 4808a11a4c280587…

MALICIOUS

PDF

88.6 KB Created: 2021-10-18 23:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7694087435ffedff6c8f159eec89e565 SHA-1: a6dafc9b817fa8ff8d2cc2ebeb3acbf1e11e4d28 SHA-256: 4808a11a4c280587eeb80f77121a3e2dbba6fcb8172182e4fa0c6c317906f99f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link farm, with several URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious files. The embedded JavaScript stream, though not fully analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating further malicious activity. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ifaistos.reality.gr/~triantaf/images/file/xolosaxizujisuwikozasukas.pdf In PDF document text
    • http://btsoft.vn/uploads/files/wiwonatasimak.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/meputerat.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/legutet.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sekokigoxitapafa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/f61146e9b415707e40762f152a502acb/38929132279.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161635bdc37ab9---61730914184.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161370f9120de8---79627931276.pdfIn PDF document text
    • https://stopserv.ru/files/file/wilesajajibekolomaveweg.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/gatidabunorajuxikut.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/fetofe.pdfIn PDF document text
    • https://istanajp2.com/contents/files/xugusuzafavofumixonowo.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/mamiwiwamodon.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/85079994233.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615911b25b3ef---tazotimelilabuvojobutage.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/33007131734.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/jinumavufedimusujujiduta.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/68066408486.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/fogodananumozer.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/pupoxawimi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1d1c56ea9---ludisaxuboxuzelakenaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/KGDyd8lM0uI/uplcv?utm_term=online+converter+active+voice+to+passive+voicePDF 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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 10456 bytes
SHA-256: 50ea278167cad3bcb96d107ee2960301eb9f018aaf53003c54439500a1e0f974
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C7 19180 bytes
SHA-256: 32073cf6bfb3cb5e832711e103d04ac1c27759a9d218f5440a5f23e2c34aab92

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