Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb3b5be71e79fb6…

MALICIOUS

PDF

164.6 KB Created: 2021-07-05 16:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5ac8ae7faf0392f533114e155d3776e5 SHA-1: 41dfb829b9d780bde8e77a51ed48b5f43696ea0e SHA-256: 3eb3b5be71e79fb601ff4a0da928c73dfa33dc9d09a830ec080316381cf7c3a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites utilizing the Formcraft plugin for file uploads, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1dabe821---popevima.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cf3c54fb---vanelelesum.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/41873833643.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/63377245202.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967fb94c4b3---60566648881.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/670211b2e127520c61e2ab3df38d8554/puxivaloxuwazaluzirut.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/madagavokiti.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81cc6c3199a7b8de5b102c1cf7564ad/30146328068.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/mhbal366cuh9qh6cisal09hedv/3465455032.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/wolavodadafizigejepiwiz.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/ziwirivar.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ecc5de613---zevolizepelusunanib.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/51420056119.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jixazuxu.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/sarovazumisojef.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f3ae8228---32847051578.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/nuwosekugurob.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/19720160971.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f0046atu13i21f83os9ama25ri/kokixenonen.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/gevokojezemir.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/kv1bqeoub2ecalpgpb25uemf8q/kebibesagiju.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/gob4svb50rp1tj3h7gpa1kme90/tajotusuparunogefiwizidu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/50e2768696ab9ad61bc2c53c4956bb24/65607257259.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/lirekavip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=fate+stay+night+which+one+to+watch+firstPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ae3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C64C 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_02_sfnt_off0001dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBBE 10744 bytes
SHA-256: b9a74d32d28da523889668dfee4b5a3ef51c7a94523646d51ad46e5688d62da0
font_03_sfnt_off0001f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F480 20488 bytes
SHA-256: dd10bf3ca4fc84d578cfebf4310aebeb2b57493b74ab027aedbb7679df53c407
font_04_sfnt_off0002289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2289D 32028 bytes
SHA-256: 5f1b6234aeab913e2c7607d75d398fe39be964b5e6eaa466a5878acbdf1a636c

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