Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9e97fc5f50361c…

MALICIOUS

PDF

89.8 KB Created: 2021-09-04 12:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96c6f888383e1b79e03cb1324618adbc SHA-1: 5411b5bfc40e7e69e8a97d1edbcae307d69ccd4d SHA-256: 1a9e97fc5f50361c8108685f6f207c7b7e6492c7aae3057b0d5781410187d779
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://ketchas.ru/uplcv?utm_term=social+challenges+in+south+africa+pdf
    • http://numere-mopede.ro/mm/file/watoxusodituzoj.pdf
    • http://martonaroniskola.net/userfiles/file/vetidarenedusep.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d491dc39c45---82899449059.pdf
    • http://albarossa.jp/js/upload/files/jojigusarojidifawitufug.pdf
    • http://myapartment.de/web/editor/files/58571540403.pdf
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/40114725406.pdf
    • https://bd-sokolovska.eu/userfiles/file/vutikoveneralakitederirav.pdf
    • https://kidneystonetreatment.in/userfiles/files/borubaniwodimedululomitew.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2cfdccfb7ee7a9a92cd629e12192c649/33524081511.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/37621a305b65dbe88baab4923e021663/wijubajewusapokatufite.pdf
    • https://aduanaldelvalle.com/userfiles/file/77217933181.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1642ee8bc0---pibowofapajefasakut.pdf
    • http://wintec-samu.hu/uploads/files/47340573257.pdf
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/1345655242.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfca904b1d---wajitinukubulixute.pdf
    • http://aqbnb.com/uploadfile/file/76863884760.pdf
    • http://discus-rus.ru/upl/file/vejesusobelotuxeg.pdf
    • http://kielcenoca.pl/files/file/zarad.pdf
    • https://isleo.com/i_photos/file/44737765277.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e782a7ffa210f91f822750d40d4ca678/dozer.pdf
    • 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_off0000f861.bin
b9c3a89cbdd7bb076ba1f8254fe60c3706dddee5e880c6045c286dcb5d7332ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 11072 bytes
font_01_sfnt_off000111df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 16792 bytes
font_02_sfnt_off000129f1.bin
03ae71214c07dec7a4c8935341079b17e1cc86f3bab2b8d87291cdc1f200213c
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 18520 bytes