Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b0dfff59d775f8…

MALICIOUS

PDF

78.0 KB Created: 2021-07-18 00:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32330a8519c6068593a69be49c6edb4e SHA-1: 52a674f8b1fb98fbebf4213eead7515f900b2d4c SHA-256: 89b0dfff59d775f8470fa8e0c4d35fd246a8a4c9480faedf397c3cabc0b1f8ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malware or leading users to phishing pages. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/55bb0945cfa0beae0a9de233f5699fbc/22458985449.pdf
    • https://bruceautoservice.com/files/file/12278950211.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b234dfb9d70---renaxikeroteweno.pdf
    • http://pressvaluation.net/userfiles/file/11391629053.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ajrqtd5irl3lpmj7031bomic2s/rajazaseroduji.pdf
    • https://capital-tic.com/upload/ckfinder_temp/files/20210706064734.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dd6b5931db39987f6eee7d7adf3f9d77/60727042472.pdf
    • http://nw-line.ru/generic/uploaded/likumugeb.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160869b5e78f06---zelurimipim.pdf
    • http://celcg.pl/uploaded/file/41778685424.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887f7cc69d9---vanud.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/76432a0225d21636f0974832fa28538b/62886170603.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7ca0b02b54d2fe8eab65724203ab933b/94372613086.pdf
    • http://zhuoer.ltd/userfiles/file/ribasagemusijav.pdf
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/96473447892.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/93cdf00119baf8ebed028aa440480e90/79465263495.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160afb49dead3d---67747944458.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/557292f6428a3289b6b8c6bd0877bf1d/57889871867.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8e8aacc093d1f3cf6e4335862e326b5/kozinivazufe.pdf
    • http://weingut-suppan.at/files/bizirafuj.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mg3ibip6vickqv57dvhqpdf043/fozejawitogugesazud.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/87071759588.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ed8bd354902b6d787dbf8de8d8ac5e69/nuwalajofobipenejaxabix.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/49b1a766d59dbc58beac2b7e0987d38a/50237217090.pdf
    • https://radiosmile.hu/upload/file/98735407679.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=beat+me+to+the+punch+meaning
    • 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_off0000ccad.bin
5d96faa9fc2873c35aa67dfa91667a7027f128d4a4191bb4572cea4d7077cf52
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 16904 bytes
font_01_sfnt_off0000f8b4.bin
1813691a4689cc414148d3d827f474ce57f2358f23ca64dda8d49d8bd2bd6eb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 10660 bytes
font_02_sfnt_off000110f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 16792 bytes