Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cdff5a06deeecd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 23:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6cff1bfcc66b5e8c1fc70d84ea3bec5f SHA-1: ec579e28d08a4b7a1c6dcb424c0e801413861789 SHA-256: 84cdff5a06deeecd8606370811ce54b5344f536a593f9cfba553d85b190bb902
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sangiorgioautoservizi.com/userfiles/files/92166285720.pdf In PDF document text
    • http://80tner.netsociality.com/upload/files/vipakejawosivuwujex.pdfIn PDF document text
    • http://cecev.com/stockages/files/wimowawap.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142519d1dabb---pegepevorifiwaxofafo.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/96932864922.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cebcfcac---vijutita.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/pusilekaxo.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/pefefujirefu.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e760d30468---27944370611.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93bd0871d---wuropofow.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/kisimogesokegaloz.pdfIn PDF document text
    • https://unitjaya.com/contents/files/luzesipigabejusebadef.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/zomuzolikifasejadadeve.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/zakepobitixofopapifugelal.pdfIn PDF document text
    • http://esangsok.com/upfile/files/92653158298.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/44321081007.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/oeo6rijeb1anba877eh0jhjugj/66887352445.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/43180677550.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/88310564674.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6defc995b31d8f481d44d36d84aa94fd/97928315256.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161403223a7af5---31305993814.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210917041348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nanka+mail+full+movie+download+filmywapPDF 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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10728 bytes
SHA-256: 04f0fbd4831fe143fdd8e157c04262b7bdf0ec7d3e578579cfb160deef8791ff
font_02_sfnt_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 17692 bytes
SHA-256: 7b5d489089c9062d3a334fbc1c32fbfc25f71f5b214456c603bd54ed2854c32c