Malicious PDF — malware analysis report

Static analysis result for SHA-256 11aaf7cf2d845ae8…

MALICIOUS

PDF

89.8 KB Created: 2021-06-30 05:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb92cd1df2d24945337e525d7367d0b5 SHA-1: caa729a9533c39f24b5efc65654edfd65b8a47e3 SHA-256: 11aaf7cf2d845ae822b986a787805f81b61dd96e440405264f531aa703bbf3db
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised websites, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the heuristics point to the use of external resources for potential exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://upoart.com/ckfinder/userfiles/files/96164154785.pdf
    • http://statewideroadservices.com/clients/879378/File/nofatefunujewemigeda.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/aa21df965cf226273ba508be09635446/60872057070.pdf
    • http://analogsys.com/uploaded/file/830078916609e35ef3d0b8.pdf
    • http://classiccar-jp.com/js/upload/files/9648413161.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607657983d6e1---76270934518.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3d0a4fbf0948edfe75c9032619c67338/sudavuvuro.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/67962964972.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f25b134e---xumakivufopetor.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77379b336f---vofiwuxagixuru.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082317dd567a---fideboga.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2deb6e84d---tojuviminenuvujosunoz.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084adfc19d8b---32033827756.pdf
    • https://aawyx.com/sites/default/imageuser/file/35415439536.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d62a14f8---79572285029.pdf
    • https://et-auditing.com/userfiles/files/dupuvub.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a00af74a8d---mujegowugelubopojojub.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64db95e4e5---20297710631.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/dalukivakudifujubewuvu.pdf
    • https://emmaushuis.org/pages/73195126976.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a100c275a13---40035640097.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fb7afd47217beeb7ef4712fa22ec8fc2/vitutilixiduta.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c77cec9b385---baxunirekif.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/75996fbbd30d5ec77a63d004e2eb8440/41900832466.pdf
    • https://doganagolosa.it/file/xafifutewezenulowebekorup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=demineralization+of+teeth
    • 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_off0000fc70.bin
50386a7933ea129bb38ea8cc7fcd647b3b59b46918405b14f391c66f29783859		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 17228 bytes
font_01_sfnt_off00012904.bin
ffdf8eaa038fd3ba32a7f222a6e0e4be73921772d09c539b6153e2c8c967bf92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12904 10372 bytes
font_02_sfnt_off0001403c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1403C 16792 bytes

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