Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dce798ca7bd2abb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 23:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9fcf40c4020170408b6b296bbd329de SHA-1: cfc9d69e417dbf430511f5add40c41aa86882797 SHA-256: 3dce798ca7bd2abb5f95bb625723b94cf913b9afca9b9ebe1714c5c648bb75af
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613be840225ce---kofilidi.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nujuwus.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/32228721114.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/fawaxizafomor.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/76597512387.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/sazitemunez.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/satixixitojisapuk.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/repetetot.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/wugogo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b4535r7afaj9nqibsh8n2348ev/41153142589.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/porawitazafoziriki.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/25277440805.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/15406906395.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/nizivorifusesoxefuzin.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/fulozofikota.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59cb429e0---90981277341.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/42585610268.pdfIn PDF document text
    • https://kuepancong.com/contents/files/30596479019.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/depivifumedesiwokavufelad.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/71111846690.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/redibokajamizig.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/lumoneja.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sutivuvutil.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/71584061472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=war+of+the+zombie+apkPDF 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_off0000c686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 18568 bytes
SHA-256: 924a1b0371405d0f47ec03f8dd91f23bb11fdbc20049575c8277e54dc6e5385b
font_02_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10592 bytes
SHA-256: ad8dc377b1f2a1612f51afe043011d516f703c766e173d623c16cbca5ca1f6ae

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