Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f39a66ac497ebd…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 06:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c5303609caa9b58d35231341dc46e0e SHA-1: 43cb3dad6ec86f4c5e45bc73a5e5def276dff610 SHA-256: c8f39a66ac497ebd960072c95237c7618f2b5a783eddd3439a988e8fb9b1284a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs, some of which point to compromised CMS uploads or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://svx.su/ffile/file/90686005587.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/nebusubojidoduzuvefemigi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/f682110df9968c53838f65af07f0423c/judug.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cd337a7b9---96764642979.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/96aeb4222b356d962a4e128a8a4f940c/galavagukebagomena.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/ribuxodewoman.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608825dda6d78---morikujidarajikelif.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/23021863850.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d383ef2ba7e---gazulemejamaxanefupoga.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/nemuvosajejaxupitupod.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3953220d0---gaporotelijetofatev.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622302234.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/62120653595.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/39314570307.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/t9rg66st7f8n9p84edvsutudfb/70788671614.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/66870004037.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/34041336062.pdfIn PDF document text
    • http://www.polni.si/Images/files/misarefabitisaguj.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a979d968f8f---dixaxaligemapakur.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5fe4e94e---7545932452.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/16991196142.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/ferevuvegodukudagimu.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/vasadolavinuzoxoxukelig.pdfIn PDF document text
    • http://iccarrentals.com/files/file/leruzadabape.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/kotujixit.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/28008540557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=letter+of+intent+for+transfer+of+assignmentPDF 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_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 17396 bytes
SHA-256: 21f558673d6c3c6f4995869550b9bed7d33f078f552d55ad1277e60e035f1d6a
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 10468 bytes
SHA-256: 760f0c85a6460041805e82130c26943c398b5ad583095baa0c977e3195699755
font_02_sfnt_off00011388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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