Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35fcbe4592a47ad…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 11:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6dbcec05fc0c8e4d4734aa3a2286e9e1 SHA-1: 581e629c50e3771ade1a8eaba02eb7401f07584a SHA-256: f35fcbe4592a47ad8957be4f5f1cbd3416e6ba97cd9fdf82cb1c651eafba15e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links likely serve as a link farm to redirect users to malicious content or download further stages of malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://rakkhunnursinghome.com/user_img/files/nipezupotakepufamupasos.pdf In PDF document text
    • http://deauville.ru/files/file/doxumofagufojegugit.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144cea83f84e---jowesuxofi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2423a82a---wivewizorexujazesexasibon.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/80303771847.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/22771688871.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b3a9bbeef---11635400714.pdfIn PDF document text
    • http://esejsc.com/upload/files/80561459209.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/84315808143.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/ronow.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/neganivadexaj.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/3125f7f68b26e89b40f19b361deaf7ca/sumabapajemupotulufotev.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/1754442848.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/xafezisedaxejuwas.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/jopowopatara.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/kegexomofefotin.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/41902568036.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/lubajegemedufites.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/64246971645.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/28959767722.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/54674429613.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/jaxixuzujeruniw.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/96842116922.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc71ae43bf---52916955302.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/39752061841.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/1237272982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=peace+like+a+river+book+pdfPDF 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_off0000bc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2A 10544 bytes
SHA-256: 6a1a92ba2856086e77e0aa85c9a322c5b861cc7f1341cc01abec8c02137ad948
font_01_sfnt_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 17944 bytes
SHA-256: 30c0c8dc8b348b82d71cd6e87303f2b95505659c533cccac03d13a4256e0665d
font_02_sfnt_off000101ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.