Malicious PDF — malware analysis report

Static analysis result for SHA-256 be446a95b9f17103…

MALICIOUS

PDF

98.6 KB Created: 2021-06-27 03:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 894a9cb842cde2c1fc72f679bd80eab5 SHA-1: 17e1867db320c12af8232f2548da31ddd16ed324 SHA-256: be446a95b9f17103ed73109058b7032c5bffaf719a837b91f0d6a6b748ab28ff
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • 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://1-cx.com/ckfinder/userfiles/files/purugole.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91ec10d5c---15696838654.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/23d9b5a896e0d84bd5250b64d5780b1c/34721503347.pdf
    • http://bielwod.com/userfiles/file/69155577730.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6750d0ec547f31422efe2ad4ce15c2e5/81006486633.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086f11f380cd---puxonu.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/5b579645276211ee45e5fafe9d23f63e/78329047238.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/46930501983.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac63e138d---libikusubuzuriregul.pdf
    • https://paperland.bg/uploads/file/tedupotatatukit.pdf
    • https://yuss.it/file/62136811302.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0b7c79d692dd61b8ea6e4018f18f203c/58306582777.pdf
    • http://absigorta.com/E/file/buratolalemupewexafux.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16097102bc4c8d---9244315395.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9112a0c26---remev.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1e562bc2b8a4c1f33b8bca65f9386b2e/titobexirafikanumot.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ba371fcf2e724b0cb65a837b9e30b640/gukenajafirewaxumigutiw.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcce2ebb59.pdf
    • http://matstravel.ru/userfiles/file/sesoworav.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ej211b3e5jj5s832gmqi0f2qeq/dikuwutusuwafigojow.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/dozezeteruvera.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c876323b22---xuwutonuvavu.pdf
    • http://wenxuezj.com/images/File/28831104047.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160924a035734d---vewixuromupusila.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6737deba60---muretizumujikugama.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=research+and+development+pharma
    • 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_off00011c71.bin
e7d2e62af05d39ee6d5fe9baa6bdc512585668bb938a712be1e807d881015fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C71 10796 bytes
font_01_sfnt_off00013530.bin
78e7202f002d4ea425c2a4b91eb6509bede1aadc70ab072313db7f7e820149f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 18284 bytes
font_02_sfnt_off000164d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x164D8 16792 bytes