Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f27d3beaedba105…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 02:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45613c2616089f2cf452eab515ad28e2 SHA-1: 8b7d1378953ace0690ce2e3cfbe319c6d7af340d SHA-256: 1f27d3beaedba1055bc923c854e2b84c8abb0b323727d4a7f4a74ea647751238
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous embedded URLs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ae92506438a34bb9fce2fea0221e6494/lobosawebegonakokeved.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wevexaxopubi.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/ropoxinujugavobov.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130970f08716---18338404880.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/96091487373.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/24216317318.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21044019992.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dipakajur.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/67007196676.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/jiferovekale.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329064a6f08---kedofofujogumenoletelovi.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6376fd3d8cf78f796694b46c7db01068/sojitugi.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/82527023285.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/41243733002.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210903_ED088462352B056A.pdfIn PDF document text
    • http://gdgom.com/upload/file/210905031022342854fzavlgrdkyki.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161427f40e2d30---20466517095.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/vufusoduxakimox.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/24827889675.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33633065027.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/nixemekekaf.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/bejuvasisoludoxexatima.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/86285515310.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_7CA2FA9C7AFDC897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=come+programmare+un+app+androidPDF 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_off0000eea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 18292 bytes
SHA-256: 5736977342bf7fa15c1ea5b7ca2271743375dd082d6fa2c4cf8fe110cd47e615
font_02_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 10556 bytes
SHA-256: 2c5e356c955621bdc362d37854b28384b5b6903389bf8654883358eb9ab5cf03

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