Malicious PDF — malware analysis report

Static analysis result for SHA-256 084dfb9e8f95c5a4…

MALICIOUS

PDF

81.8 KB Created: 2021-10-05 22:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 169928cc446b6a5dc6b8a829509ec111 SHA-1: 8b97e81681920837d4ddfbe124de5112f2c8c19b SHA-256: 084dfb9e8f95c5a4d843c19f8dd392691d173be881eb92cf4918c6eb6561f992
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16156693bc5ae0---wowagite.pdf In PDF document text
    • http://candientu24h.vn/webroot/img/files/desodudokib.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161593b3624b42---68537712948.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/gewabirojebilajowe.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e50116d5---wametetidorijesejamir.pdfIn PDF document text
    • https://network-italia.it/file/fefalivexibafoporuzaruv.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/tetevajofuzigujigawa.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/najubixevukevazajimerol.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jewuzagevefiko.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210927072806.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/gadagizami.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/24534789588.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/kerilewelenorilifin.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bitedumexesojejululef.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/rukafaruxexisejib.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/6236560168.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021092711595873499.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/wimagafum.pdfIn PDF document text
    • http://topas.lt/userfiles/file/jiwudeboreputaxefivones.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/20529217621.pdfIn PDF document text
    • http://sbcnepal.com/images/file/30517186975.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/baxiwad.pdfIn PDF document text
    • https://scalping.ir/data/files/file/lifixuvovutokukofivafexo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/47778679758.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161584405bfd70---golepupoxexakilexudin.pdfIn PDF document text
    • http://topp.pl/_topp/file/96109454117.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/viditadurakopuzitawelevan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+m31+and+m31sPDF 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_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10924 bytes
SHA-256: 4a619c071bf5c5a7fbc11d0469714ec409b1f4c83a58aef0750a825b84eccf88
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 18020 bytes
SHA-256: c74229c6d233597901fede72963183d4af5bcb14a4fbdd76fe6e7bc553818e63
font_02_sfnt_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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