Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ee40cbfdb71d0f…

MALICIOUS

PDF

122.4 KB Created: 2021-07-04 06:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7360333f256f2461edcfe6c61d2a8302 SHA-1: bb7085788663b20d4b1097c05477b26d20013aaf SHA-256: 81ee40cbfdb71d0f53c262047c68963b69d32f274dd6bbd6c99f60648b0691db
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely to phishing pages or to download further malicious content. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9576

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8db6cc7a---74347126697.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087196ec4625---85025592657.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dccdef5ac---57755407191.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/pirozudokux.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/rsinaetvfj1gf1m7jvm6v8fjk0/lejekefow.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/firatijijudupabosulerag.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dfeb4e23ea3e8f4a1c9b29458fe4112b/zirokutonodezaw.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b5863f64a5d1049d726f6ca8c0a8848c/10865939728.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kuzewix.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/64811862226.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/80089735774.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/2536582879.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76b2ae124a---54308910473.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/79337479261.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9165521048.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/nogugetilewobepawe.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fb55d5f04eb93542a5f93d8759c65d3/67399545650.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/38770004889.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02426a236---79857504119.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607495bab4558---duxamape.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8650b00477---zilibediserarojezib.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c7d6130d---29285871377.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607055ab4725d---romalikaraniresaputulera.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160826f0501b07---70826198615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=words+with+2+q%27sPDF 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
stream_005_off00019c1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19C1E 25120 bytes
SHA-256: 118d562eda3475d7d0afdb115e956444003eaa8309d25a05e87ce4f9a9233e72
font_00_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15225 19432 bytes
SHA-256: 518e5e80fc9759d1c9c7274c603cf8ef5bcbfebb99cbdebe04f791190b5600c5
font_02_sfnt_off000184f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F8 10280 bytes
SHA-256: 5ebc46ce0f4fa79e8fbaa2114dd37ff24a7d87564e0dd02ab65d45e121a1e60b
font_04_sfnt_off0001cc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC02 4148 bytes
SHA-256: 8b873dce2b8fce0e75c7fbe7629d0fb560f2c5951d1df7aaa3906b7ddfddf514

Open this report in the interactive analyzer, or submit your own file for analysis.