Malicious PDF — malware analysis report

Static analysis result for SHA-256 2343dbc744588af3…

MALICIOUS

PDF

81.7 KB Created: 2021-07-04 17:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63af07b8aede59c5b3002d38fd5f27eb SHA-1: eb7fef9f5a2444037c44cb910fae1b79d5f5c654 SHA-256: 2343dbc744588af35178a2262e98f8e872cc5c6a2b3346b77471c8e6f87e02fd
136 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link farm pointing to compromised WordPress sites and disposable hosting. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content is designed to trick users into believing there are new or changed bank instructions, a common tactic in business email compromise. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://prosaison.fr/userfiles/files/fikajeribagivo.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab25af378---lobobejinobeba.pdf
    • https://oykufestivali.com/ckfinder/userfiles/files/79127788485.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7b5c053b---75943410094.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/n0m5h2891i5vsj6lpkss5fj4og/92280694550.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16089e26c84a55---4609355496.pdf
    • http://martom24.pl/martom/userfiles/file/79760414447.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab96b270e8---38526764005.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624c34cac3---jatekonegobivigabonim.pdf
    • http://movietek.vn/hinh-anh/files/xugofo.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/40340294085.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/22d10a36f4423b16001dcf9db8c39df3/69958096628.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/q6kbamfmgbnl3avdjhqajbpad2/vefebapimonunidovetowumas.pdf
    • http://www.thaiboat.net/image/upload/File/8321379850.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4likloa4nv3a8eiathbe0630ti/91690629153.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e30ab6da2---gexadewabegubawosix.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/327eef02b4824ea219f1350a1c67b35c/18680622820.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/566cd59cf8ca0bb6d2611d91a6dd82b2/pesonanoluvesu.pdf
    • http://iwilldoit.ru/uploads/files/files/14205706241.pdf
    • https://youkuvpn.com/upload/files/50160447048.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=results+for+set+for+life+for+tonight
    • 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_off0000deac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16792 bytes
font_01_sfnt_off0000f6be.bin
45b6aeca98484482acd7db5ec55263358767194878da14f8b9746d1691d880ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 16692 bytes
font_02_sfnt_off00012214.bin
7e121df3b15e2bd34fe40d95fb960d07be9f31cd0947bf17e35722baee7c7f20
pdf-font-stream PDF embedded font (sfnt) at offset 0x12214 10476 bytes