Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b973f4fbc4d0bf…

MALICIOUS

PDF

101.9 KB Created: 2021-06-25 14:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9681d4b502ced376e86205812449789c SHA-1: 6e81bb168b57a539c7182637e83a17dfe7a38dfa SHA-256: e9b973f4fbc4d0bfb92017d70a7d601652ff71ef027f92e660467168e4076ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload directories and other potentially malicious sites. The presence of multiple embedded URLs and the nature of the heuristic firings suggest an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607251e5a838e---16403018626.pdf
    • https://brs.jo/userfiles/files/26980624114.pdf
    • https://businesslife.com/content/file/wumikir.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s1svr8odtf9opr4fg6vqrt43bp/wiwifubewagomageges.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/412c8de2a04fc86e918e189113c75cea/pawirugodaxetijozarubat.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca80bc32cb6923222899c2f686e710b5/1534207564.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/01de4f683e05c1097f1fa70714e8900c/2646768821.pdf
    • http://pileshoppen.dk/userfiles/file/mexagibuwakex.pdf
    • http://leoclubmarsala.it/userfiles/files/mijopogigafu.pdf
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/wenalozazedapi.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5cbad3c9cc39bf6c5fa74808a1472ddb/93474229572.pdf
    • https://yingzhaoliuart.com/upload/file/zuxibonavewifol.pdf
    • http://akkoryazilim.com/userfiles/file/jejika.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160760a7b2433e---gebikaveburaton.pdf
    • http://dashoernerboot.de/userfiles/fivir.pdf
    • https://trimix.bg/UserFiles/File/95904315673.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=empire+and+puzzles+fire+chest
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001115a.bin
eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16132 bytes
font_01_sfnt_off000126cc.bin
408eaf5ffbe4f558f9587511999a3236bc7c39b06296c232205c9a11a1acb540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 10908 bytes
font_02_sfnt_off00013fcc.bin
b5736e9132acbd7f2b6893396118ef776032980f2e87e3700a7473b8f9971343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCC 19036 bytes
font_03_sfnt_off00017269.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17269 16792 bytes

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