Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a3e46577cba1a0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-11 22:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 239d2be921e4e0795620122cc9ccaf49 SHA-1: e80ca549c24e48015965e6117f8aa3765d0218c0 SHA-256: e5a3e46577cba1a0cb544e9bf90867561b30cd6e0fc90609d2b878917e2204d3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many of which are hosted on potentially compromised CMS platforms or disposable domains. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7325

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dailygameresult.com/editor/UserFiles2/files/voxetinarupovun.pdf In PDF document text
    • https://cuichi177.com/uploads/files/202109032053286382.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43431046234.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/nitafezeram.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/11092992547.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/61682740960.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/77118136409.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///belukuvet.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/gexesudagexokotemilibom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cbac31b32---tejirekan.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/46555107155.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/27148377767.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/zibugazuxaditabezotutida.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139b20565c8f---59247688075.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/10439774773.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pawizitalejinotemujogi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1f911a2b286372fa4dce1d3d38ab1da5/fejiw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/76626776925.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161313b7e78e84---84559122593.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/97796500655.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/ridumipepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=emergency+radio+app+androidPDF link annotation
    • 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_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 17128 bytes
SHA-256: 14184c2719c3cf04093ff7f93dddcd51e7aaeb280f27b12c3561ef0e71eb19c7
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 10640 bytes
SHA-256: 94fc409a028b850ec91e6a2cb13561a5c6e7021b0bf46ad5d386c240d967f530

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