Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e10c5b2ca4d771…

MALICIOUS

PDF

88.8 KB Created: 2021-07-14 03:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73cbc568d37b439c013aad377742f2bc SHA-1: 3f9cb422035f5bfc9b64f7d9bca3337d51617305 SHA-256: 14e10c5b2ca4d771ca2e4d808c124625034e868357dd762dceb5e9cb5f5c2120
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection chain to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alpanelektrik.com/depo/sayfaresim/file/29643725652.pdf
    • http://skybuildinfraprojects.com/uploads/81124752576.pdf
    • https://keluargamimpi2.com/contents//files/49841450603.pdf
    • http://kaupa.cz/userfiles/file/40505978431.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd7327342---89993119665.pdf
    • http://muacuoi.vn/Pictures/files/48106082499.pdf
    • http://www.pattyn360.com/upload/forum/files/21605188121.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e535c26628---25334843744.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70923061b4---66091695081.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d9ad903b---20213285960.pdf
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210618024934987416nkxz13.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b4fc06ddf---70599006089.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/73e782f9ee5c74dbeda81ab15d01698c/mimawapakor.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7fbc3785913dd712105473d7f70ce3fd/33891287967.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae2c9bc3---42944203547.pdf
    • http://artdealer.vn/upload/fckimagesfile/7fd05e6669762c40dad2a4948ee47d1b.pdf
    • https://aawyx.com/sites/default/imageuser/file/47065294225.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3568cd6b6a---pafomineledeka.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f5c18f64d---kugixiveferekizizufepozi.pdf
    • http://lighthouse-connection.at/myPix/file/97102647486.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/47116798691.pdf
    • https://newsru.md/upload/userfiles/files/zugat.pdf
    • http://minerva-collection.net/files/files/87527654809.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/pisosejurinefuluva.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9cb31312f---nefaruni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=90s+and+2000s+movie+trivia
    • 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_off0000f5a8.bin
585f4b9be01938d8d8fa3da52037e8eb551df51c2ec042ac17073c28c9e67f22
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 17452 bytes
font_01_sfnt_off0001235e.bin
9e83120235f962d1d140db74493c65bf920cf7e9b35ecb3845babf9a66bf4c86
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 10744 bytes
font_02_sfnt_off00013c24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C24 16792 bytes