Malicious PDF — malware analysis report

Static analysis result for SHA-256 2940c3d969d268d5…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 17:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e87e7603abc71af1fa7ff4257faac6d SHA-1: 9d916f67e48e9da0b22e11779b92a8685c4c059b SHA-256: 2940c3d969d268d5f5b9e4374ac99ab70c7fc34efc8f6763d42d4b7e690ca6ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document contains embedded JavaScript and presents itself as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. This suggests the PDF is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gangwonbnb.com/FileData/ckfinder/files/20210913_8C905FDBCA65D576.pdf In PDF document text
    • http://markaz-e-durood.com/EditorImages/file/nixarebavimujapevesutiw.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/ziziwud.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/99dc664e372e84a7aa935d8097da6481/33410808150.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/59ff4ef75bc0ab8da83662699772f62f/2333695649.pdfIn PDF document text
    • https://buka.ru/sadm_files/8255641161.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/83422758385.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/74292887105.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/45849814274.pdfIn PDF document text
    • http://agilesolutions.in/uploads/sixejirematewupaz.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/7919403211.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/nowipod.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/wimorifuzufavituko.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/bawadefa.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161326501b2d49---jozidunoraje.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/duwutusek.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/zibuvaper.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/pakedonajenigozi.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/3767770112.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/14538780252.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mafupasepepunedexoxim.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/gagutediz.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/26216958753.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7cdcde904---sigigunexefazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=galoomp+went+the+little+frog+lyricsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 17844 bytes
SHA-256: 81513f0c17f85fc52d6687ef2c60b83367beb7a368f3be2dc7672e3593237efb
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 11168 bytes
SHA-256: d6ee3e616ff30936ae13f3e0dc79bcfca9e4e6d6c553f78f3a416fbda93179a7

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