Malicious PDF — malware analysis report

Static analysis result for SHA-256 49099fd08eace5c9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 17:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3957fb87bd5a0a03235663283121d09 SHA-1: 7a9b8b4dcaff7060066b34f1c75cd245434d2649 SHA-256: 49099fd08eace5c962b664ff56c1a48ccc8f9129a5daf513260d8e3a4697e12c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=human+anatomy+and+physiology+book+pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd5e58f9b---27916388713.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/13072599657.pdf
    • http://fnathservices.com/upload/file/6010933974.pdf
    • http://svaz-podnikani.cz/files/file/1993633089.pdf
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/87157962528.pdf
    • https://pointvirgule.ca/upload/editor/file/898039378.pdf
    • http://agavietnam.com/img/files/tozisijusazofufu.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7ba12ca37---fanogubozupolow.pdf
    • http://sswjeans.com/files/1371075179.pdf
    • http://huefpdf.org/upload/file/55673803470.pdf
    • https://pmfegypt.com/userfiles/files/vaveb.pdf
    • https://mycocoa.org/images/upload/files/lijudoxixoj.pdf
    • http://aurastaffing.es/upload/file/lasusizefewivufudubiguve.pdf
    • https://happyfun.tw/uploads/files/202109181632111617.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4026d5e7625b728cf2d11884b4dedd4c/femoxidenuxe.pdf
    • http://minhanh.com/files/lomafiwebatajatumupepinu.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133439f9541f---88879521004.pdf
    • http://rainhouse.kr/data/editor/file/116980065061359f0bc9e02.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161438a6b87367---naduradijowiret.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zawubifadam.pdf
    • http://shanghaiqingchen.com/upload/files/sagukiro.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_off0000cca5.bin
1dda9063ecd946f1031a173ec9c0d060bebaf21b4971072948d131a37f1231bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 16036 bytes
font_01_sfnt_off0000f566.bin
5c7f3f6a8fbabd8d1c454b39af0230e27707cb9581284134d1eb40e3f7a3449a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 11152 bytes
font_02_sfnt_off00010ecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 16792 bytes

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