Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfec9cf762f52a9…

MALICIOUS

PDF

86.7 KB Created: 2021-07-23 21:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd915a712c47153d47ffaa1f4b27c59b SHA-1: d05e301eaaca1e0706495105636b99987166c181 SHA-256: 8dfec9cf762f52a9d336701c71ca7af048630c36013a7f4d6c399705fc7c59d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of a link farm on disposable or compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1065c53c---48376023540.pdf In PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076184ce868a---fomexixerudomibof.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wivaj.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/18568221623.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c687ae038dd---33399968995.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/84945149898.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b3921b952---mafudinabapabis.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gunuvom.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/fedamofoxu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ae3524a20146170ae912ae936ec3cc6f/wujuxew.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/96302231852.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608421c909a5a---21376812536.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wupej.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/zenegurilir.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/98780676782.pdfIn PDF document text
    • https://codecs.ro/images/file/15180056615.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc8da5ee4---powawizani.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3ac2027aecd04dcb64df4edaa49f52cf/rijananuwedes.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/606tlb0b01qsd89ke4um3852i4/7781927366.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c9abb7571---76543233855.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/prfasc4nr4fqi847c20etedmbr/fudawofujatokakowefidabib.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/744a8795fcbd32cde38ab6b98c99bd53/45184082912.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/bcb5fcdfbd14f300dbf6262363a0d448/torovexatema.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/9d32526e82759965dcd9ef3b5193993c/62678034518.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e242418f0e---60644702483.pdfIn PDF document text
    • https://picfs.com/1i0m1jIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=macroeconom%C3%ADa+blanchard+7+edici%C3%B3n+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 11448 bytes
SHA-256: 369437abf0e66e9564a1f6d8d6b1ac9464140bc25f1204a01b7d367b80108fba
font_01_sfnt_off0000f9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 18672 bytes
SHA-256: eeb72938bb3b9a6d905a77588fda7d4d4566dc5fd2df08f0fe8848c6eb15a64a
font_02_sfnt_off000129da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000141e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E7 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae

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