Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be12feee7a774d8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 06:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fe19bb94c946e825657b7c4c6c5806c SHA-1: 1f475609a6e8c8568a889adddd791cd3710396ca SHA-256: 6be12feee7a774d86f6363cefbe025e21c5af391b3c9c21a31aca87f51309010
156 Risk Score

Malware Insights

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

The PDF file contains a link farm structure, with numerous embedded URLs pointing to various domains, some of which are identified as compromised CMS uploads or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the document's structure and URL analysis suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.jindatunnel.com/up_files/file/78135373154.pdf In PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8d34ec34---69256707123.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/1122464204.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/begilijonebulapumi.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/23036749981.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/74970019258.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/rurufibapiwirovoxulemij.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/lenupaxigideberevubumulax.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/63827797919.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/76766051387.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/46426408896.pdfIn PDF document text
    • http://ubest.ru/images/file/45652705982.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ed56d55191bffcd992e252f5aea49765/14021088195.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/57162562441.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132712a587e1---favebopowisupifalu.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/53975347329.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313d7b8e09f---fewunujubepoxurubotul.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/85158108397.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/sitowupuwibavigedupefegi.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/paduguzokapifovowasomik.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109082345325285.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/ruzadetetijobipor.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/53852020882.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/43153959303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mardaani+2+full+movie+online+websitePDF 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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 11020 bytes
SHA-256: bbd91543dbd960f3005b6cf852180566e3bd354c30f90a93613abd269d6f032a
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 17536 bytes
SHA-256: 78683c208761cf332440b194ba7af7b332f86d254e4beb8a44be0e58f5bbd03f

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