Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db5ee61b5fc5682…

MALICIOUS

PDF

92.8 KB Created: 2021-09-09 14:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efb08e564bf82545d0e192379f43fb7f SHA-1: 2ee07efd48e080dfb415f7f0439727b0e00eec91 SHA-256: 6db5ee61b5fc5682e2194450676d906f93f83ee8f9a71198504743e5ca593143
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 WordPress sites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://architettipassarinmarzotto.com/userfiles/files/83142262828.pdf
    • http://canhtoanland.com/upload/files/nezipok.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b9e26aa07.pdf
    • http://csim.jp/ckeditor/uploads/files/zukibu.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5f87769---93977349738.pdf
    • https://legend-chang.com/UserFiles/files/78446762278.pdf
    • https://krzczonowice.pl/gfx/file/91721563121.pdf
    • http://lg-palette.com/upload/files/nezujabobopofivofurinuf.pdf
    • https://aventura-agence.lu/userfiles/files/7016970583.pdf
    • http://3bbb.fr/ckeditor/upload/files/wisasisevonotafowokadi.pdf
    • http://24horasnoar.com.br/ckfinder/userfiles/files/xabolun.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134fd588b752---68499299005.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/17770943245.pdf
    • https://lyna-garage.com/htdocs/cljr/data/files/54619376534.pdf
    • https://dveropolis.ru/upload_picture/83664419829.pdf
    • http://cisseo.net/userfiles/files/13013461552.pdf
    • http://officeharbor.com/pdtInfo/58028462659.pdf
    • http://coinproject.com/userfiles/image/file/96077386134.pdf
    • https://wilocom.ro/ckfinder/userfiles/files/3815714066.pdf
    • http://globalbando.com/DATA/upload/files/202109011222173186.pdf
    • http://rmgoals.com/userfiles/files/jalefe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=locker+codes+for+nba+2k19
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/49042072056.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_off000108a4.bin
bfc40cafb9f431e12bc0f97a78894da7a5538c74e498f39e2240c03aae65eb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 17712 bytes
font_01_sfnt_off00013516.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 16792 bytes
font_02_sfnt_off00014d2d.bin
1a6533fb9e7a1849558afdaae4f9d1527dff6d0244be00d056dc79688479ab31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2D 10760 bytes

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