Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb7aafcf626246e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-24 01:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9c748f346b796d382abac6fb961cfd8 SHA-1: 15f005d6aa80bb189fdfc0043b319b0f4ead23a0 SHA-256: 6bb7aafcf626246ee43a4d1f144a0d1214aa9e66c54edeb9e1101487e20d9e16
172 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to host malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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.
  • 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.
  • 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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bea61c04cfd---3660768127.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ca0279ukc5le8jbaitkthlu7t1/numelidina.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/46daa97e04b569a1df9b3b6cbfd45dd3/6893961432.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/levupigi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/11501a5b29a566fff85233722fcded4f/22250693343.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/nemifarofokamir.pdfIn PDF document text
    • https://renault-service.com/userfiles/lisawedugamumepokur.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/273fb346ed55968425a43d77585d3aa5/zolidesa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782fa2c4779---68428963523.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/14041717811.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160947582d1fd9---dapelikul.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-17/20210717091803500931.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7f6fce5ae21c452bf1ff078e680caca8/78999002717.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/19445319774.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/72580629671.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/82924187734.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160745ed9874af---povetixumixutubetuze.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/gawafasakoguparamusaraw.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vekunomemazitudipol.pdfIn PDF document text
    • https://advik.net/userfiles/file/67574303839.pdfIn PDF document text
    • https://lasanisports.com/files/musizutanofifaraloke.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830a63215bf---52253937035.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/51207473614.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbf5e5cf9---kozaratarewawizomofagaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=life+of+pi+full+movie+in+hindi+download+300mbPDF 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_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 16920 bytes
SHA-256: e38081e4a5a2d3524813d9ee211ee83d2bbcd021cc70b0367a7ad4e52d1efdbb
font_01_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 11040 bytes
SHA-256: 0d9fba241de37639df11f7281d986f8808a22ccfe9873280b878594e479ae654
font_02_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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