Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fb57f5c1a4ef2f…

MALICIOUS

PDF

196.9 KB Created: 2021-08-23 13:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b6329ad5c58631d53e965e456eef16fd SHA-1: 94389f58bb8a46fe6f60e9cbcf5acee51cfbdae5 SHA-256: f3fb57f5c1a4ef2f8c8181ab060be593b2f2a5218d5fbfe87f7c27ff0b6dfcc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many of which point to compromised WordPress sites hosting further PDF files. The presence of PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of distributing malicious content via compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bayihoki99.com/contents//files/31421587512.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/25af81e29f3281ee13ac229922807bd8/jupaziwadume.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7eb5334f4---punekatelafesug.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/21769683436.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/88330e16be0823deeb7d1193de9229ea/miberobukufutuwi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adbce62fdff---wodabokupilupukomulosi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a7go7fshstb407h1enq4lsmpj2/24079422809.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210719_DD4D79BEA03A7F03.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/vakumupuditu.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/98969411430.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ac09b7eb1c28755811f644b12e1183fe/duwatemerimatebeti.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afcee95d1d3---92651857785.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b413c55d---wadaxokurer.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f3574f7745e0bcd761430dd0628be5fd/rapujuduxot.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94e1b9bfa---nigozega.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/tetov.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/69780841448.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0298201001620169175.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/jezofekike.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/11173055498.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/vimerip.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/9303861713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=phx+to+syrPDF 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_off0002a598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002bdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDAE 9888 bytes
SHA-256: 9adeb229bbe582ffa4127f42fbc032ff94330877a0974fdd67403f8e321a3d41
font_02_sfnt_off0002d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3A8 19424 bytes
SHA-256: 54019bcc2cb295928117b3b402f32edfedcc204a9fb7c455df4a4a0ca9246152