Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a22b1f84b4199b6…

MALICIOUS

PDF

91.0 KB Created: 2021-07-05 03:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 31100c9efbfb7b10b5bf7fa7441ebed2 SHA-1: 3d8424fb1a29c43f4df2d02943a441a4e7ec02d3 SHA-256: 7a22b1f84b4199b68f0e2377bd3b1e17ed62d5f7c17bfed503b83adf0ab21310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent, classifying this PDF as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a009ec1b86f---14931003950.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d38a4cab0db1b08cb501f1dc9661c59d/meganubirumakuzujaza.pdfIn PDF document text
    • http://vodnik48.ru/content/file/rupugewaba.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e5fbb29ce3cbc5ef4577b3e6385c8124/pebenimujemojopilisowazo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/be5364e358e4e6ed845f4a61a8b0b5d3/48317405274.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/38114e68e19ac267d96554541920ecc2/toxati.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f731b6f84---66072081158.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/wedilupe.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8f5cf00b1e55d2c70c9903655fd5d982/2752361417.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/2f4ce5be527f60925ccf90e9e805bf82/62974313026.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/57406107523.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b72c1b9a86dcbd21fde208b1ea0da8f5/vidunugipem.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/69017187767.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/c5c7e8299f92b6e0843201e64656cb77/xujepal.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/zaram.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a922fd5de07---99301397954.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/vobadotejutamadino.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a45a44493---48789958190.pdfIn PDF document text
    • https://bachson.net/upload/file/19221983536.pdfIn PDF document text
    • http://3sdent.com/upload/files/14910672669.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/gafotidezupogunamomi.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/porekararofaxokalowezub.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/dopixem.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t9nb46t8u8up21krm7mrsmidco/20338521486.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb90498bb4a---34649275906.pdfIn PDF document text
    • https://drsaman.com/files/wodimuminefupuwim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=definition+of+assimilation+in+culturePDF 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_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 17172 bytes
SHA-256: 02def34d894194f3d83a4da79f4ec3332c1baff556040a7b72545e6d7d54e584
font_01_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 10600 bytes
SHA-256: 3a297c812ba5d45c4be0917a527149408ac0bad0744aa0d1b029b24e5ee3f3ec
font_02_sfnt_off0001466a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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