Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef4157d3c8f6136…

MALICIOUS

PDF

85.4 KB Created: 2021-07-10 00:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2b3de707ad7ab6721fd1e7392cc40bb5 SHA-1: 29afa020ff3afa581009a2949443fea2963b71d2 SHA-256: 3ef4157d3c8f61368855af397fd996d21a9e0b68b050e5b38dd75b392dd92e3c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document attempts to trick users with fake financial instructions. Multiple embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting a phishing or credential harvesting campaign. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=fearless+taylor+swift+2021 PDF link annotation
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c52e686dc---sadijilivodagasigozo.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78707054757.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/39ee3c7103f42c46866baf86995b25b3/nedejorelapi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/defonuzajifabo.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/kenazozenirapibedalilude.pdfIn PDF document text
    • https://webmenuplus.com/images/file/juwamamoxamijuxo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3291a5144---78956078504.pdfIn PDF document text
    • http://namngonviet.com/user-/files/31225768634.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qvbusqdud0e0bf6n4tom5t65sj/65820619094.pdfIn PDF document text
    • http://apvn.info/userfiles/file/47565170345.pdfIn PDF document text
    • https://tonitomov.com/picture/file/7873471968.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abcadb803da---20012192476.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e1ea6b9e9760e138d9ff56a88a249ebc/46242021464.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f604b5ed72---80023304864.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/xusejosemaxonobilonibavi.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160949d1320b94---2262623624.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da4b93fa4---2600087256.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8b02632e145f247064fb770eb879d6cd/niwir.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/ronikidikolutovunavubis.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/jotolozipojurexegad.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b641201eb---44166295215.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/tomuzor.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/zejotixenidezeruxefivit.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba74f111c---fepage.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16744 bytes
SHA-256: 6c5c16fb9c87a24582db3718858322cd43f8d1f9e15d2c87cc89f8731866aab7
font_01_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE3 10572 bytes
SHA-256: 23401792f1d0cd88889a15f35c8d2aa372f37d4d2935461e9580c1efb6307543