Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf6373cc0d7d03b…

MALICIOUS

PDF

93.3 KB Created: 2021-07-13 18:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4e07c64364333df3750a53e9091a30b SHA-1: 43ae6d12864dd40a1130ffb815f740e0836bed03 SHA-256: cdf6373cc0d7d03b0de7e0d7818f3df73755ba8fb296dc4552939ce74db76e8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20e6c2ba08---rogodepekajore.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b88a90c7e---15489701155.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741a68a9255---tajajujus.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706c42dd665---kefuvomupudutoxilalejoxi.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/xemukama.pdf
    • http://teranor.com/ckfinder/userfiles/files/6643262274.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/5d9fc20ceef696e9ad5cb471efe1453a/42365627669.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088c20e7bacf---58194444990.pdf
    • http://lapenya.cat/imgjovesnaves/file/92395435280.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/xiwifakelogasebela.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/96390282395.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8652897fdf36157805302ea2f62274d5/lesedarapufezu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f933c919d25b267eefabbeb647bcce27/sotororafete.pdf
    • http://www.puhito.hu/uploads/dusuzujerare.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a84c3d88041bc731ea903f3115e08381/24805555192.pdf
    • http://www.findvoters.com/userfiles/file/fozovubasig.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d8121a0d---28794093236.pdf
    • http://podlahypilat.cz/admin/file/39777396148.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863045a2ab---71239414850.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873dcc4f7b3---31723054198.pdf
    • https://alajuusa.ee/media/contents/file/fejovel.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b65fc27e30db0dc1489feaf3a6eb87cf/bezumezu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=courage+the+cowardly+dog+creep+tv+game+online
    • 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_off0001079d.bin
e27cc4f66326f198bd624db509ce1518aa77ed5a5b6aee3e39127ddf3f0c8e3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 11188 bytes
font_01_sfnt_off0001217e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16792 bytes
font_02_sfnt_off00013990.bin
a91984435c1bcd2364d3f1b0f2b5aab5e6b7e5b4a941271eafbd607130946930
pdf-font-stream PDF embedded font (sfnt) at offset 0x13990 17504 bytes