Malicious PDF — malware analysis report

Static analysis result for SHA-256 4875204024bed78c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-21 23:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad9e455864f4db067c4ce98ad5e8c873 SHA-1: e35911cb1a4af03e1744fffc661170fe9980105a SHA-256: 4875204024bed78cc384112c1c69e5149ef6705286c6fffa7080b4bbadd3b5fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=in+time+2011+full+movie
    • https://cebubigsellers.com/userfiles/file/50558558881.pdf
    • http://ctkupavna.ru/upload/file/retazamaxugaxasugowuk.pdf
    • http://myshiou.com/uploads/files/202109140755441748.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/najepisupubiwexolafodu.pdf
    • http://checopharma.com/upload/files/82231984537.pdf
    • http://lafiestadelmoto.cz/files/file/63367025750.pdf
    • http://gokea.org/upload/editor/files/wowabiwuwupasisajaxegum.pdf
    • https://sieuviet.net/webroot/img/files/xowuro.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1824bd861.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/tufivaligejegomeserem.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/95331908375.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/70927644217.pdf
    • http://myphamvickwhitebeck.vn/luutru/files/falakememodozomot.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/lozulonizebuvawoj.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/tuzudufidilogibutir.pdf
    • http://mg001.cn/upload_fck/file/2021-9-19/20210919210820601242.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161392b1f062f5---40073983510.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/299f5936c83474d286112a274a5c2ce7/9493841887.pdf
    • https://elmawadah.com/userfiles/file/87037776612.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bekafopale.pdf
    • http://wsospice.org/uploads/userfiles/file/file/zudidogusilisuxaviveno.pdf
    • http://curvesncontours.com/userfiles/file/jegidijifutuvukaze.pdf
    • https://homecareangels.ca/files/files/files/liluronote.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ed41b3ef4---69736620113.pdf
    • http://ourconn.com/userfiles/file/202109121038013111.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_off0000cf55.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 16792 bytes
font_01_sfnt_off0000e76c.bin
4891b22243bed8691e87301205039382eb7a1f69831cd690b656494c7b3c6e98
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 10356 bytes
font_02_sfnt_off0000fedd.bin
e4b725e497ffa706aa50f0f629affa5943874fbd205a66848f48d0075bdcaa24
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 17176 bytes