Malicious PDF — malware analysis report

Static analysis result for SHA-256 5514f495c7e8e387…

MALICIOUS

PDF

77.5 KB Created: 2021-09-11 14:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f70b7cdcd7be5be17c433aa0fedcf49f SHA-1: 98569db756cb32d9de7b2c8f46b6893598f88851 SHA-256: 5514f495c7e8e387061393ce3ff8a01cfa34a654f3c54078f40ddfbab480dbf2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=android+pdf+ocr PDF link annotation
    • http://fotosvatba.net/userfiles/file/batukabunox.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/85792683018.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210907_094545_123.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/lazanupomemixad.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/bobuxu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f2b41d56---13210023776.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/bb9f0bfc8106398073b0359b27f860c4/zomumixafumememexiva.pdfIn PDF document text
    • http://youil.org/userData/board/file/fumizukotu.pdfIn PDF document text
    • http://labonscafe.com/userfiles/rodebujapubajogo.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kugovoluf.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/294465066.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/dokikenezikomafapuseda.pdfIn PDF document text
    • http://greenld.com/userfiles/33585490369.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/52639776317.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/jatogopunaza.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4e4268b4---xubakuzusuzoxel.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/67640557560.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/80178724134.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363bba883ac---dulutasafisig.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/bobogibewufixamipalozo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b3e9e85dbd49ba8528522b6e5414164/nupesadomalunanufomu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3954188ae---kofodamikibu.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vudifezekesofexib.pdfIn PDF document text
    • 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_off0000cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 18032 bytes
SHA-256: aafc2ddbf2f2df52c1ba48352189b50bb23be3c27206f229d7276c6ae6e4fc9e
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 9988 bytes
SHA-256: 45caddfc2e740f03468234058a9c1ac820641e43829e1a0ac774fbcc8b5c320e
font_02_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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