Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9cc9c35f751cdf7…

MALICIOUS

PDF

81.0 KB Created: 2021-06-25 14:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5b5257ed066a7656c66a5485a2dd2dc SHA-1: b6c587cd47c4506f10e6fc1e6df5cd6f94667eb7 SHA-256: e9cc9c35f751cdf7e011f8a1a438b4a5a2f2fb99c2080bec36d25f3b843ab40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with multiple URLs pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7c4a6cd4---97538345676.pdf
    • http://leoclubmarsala.it/userfiles/files/25040121341.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb78c6236f---riragida.pdf
    • http://cymagun.com/userfiles/lubija.pdf
    • http://palami.by/images/file/74271542253.pdf
    • https://hiroyoung.com/data/files/dokuxolarixoripapu.pdf
    • http://www.awakohchang.com/image/upload/File/esitog.pdf
    • http://pamatudarbai.lt/ckfinder/userfiles/files/fujofireziwikamibufexujud.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/dc3ee1090a9a4488d3f53f272cabd077/dulinezosam.pdf
    • http://bygreenpure.com/userfiles/file/sagadekekoraz.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1920f7a4147215f3915e33b59bea2b1d/giwokurisebuponagifibelap.pdf
    • http://morgancountyoh.com/userimages/19487579050.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c872db9f8376e61d2699e050ddbfefe3/mivelop.pdf
    • http://fujavietnam.com/images/Download/kuguvifipeki.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/83251446394.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pred+20+tablet
    • 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_off0000dd5f.bin
cb763092d91a28e2fab0756a1e909e6e3ed8a9b93c73223a44dc3817aa0459b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10140 bytes
font_01_sfnt_off0000f433.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 16792 bytes
font_02_sfnt_off00010c45.bin
43d1be79e6868a3b241c6ce63cc613270ce0a5a60a4df8144419733d913caa55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 16672 bytes

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