Malicious PDF — malware analysis report

Static analysis result for SHA-256 76cfd4c70815f8cd…

MALICIOUS

PDF

93.7 KB Created: 2021-08-31 13:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b046e9b4f270b993cd962c7c4254fb72 SHA-1: 3649d80b4a28c8195b0f95d90ee60beb9050ad54 SHA-256: 76cfd4c70815f8cdfc7289357398726b0143ede2902160b43762b7831f6bcb3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9690

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://mudrkanuch.sk/editor_uploads/system/files/wisebabapuzefo.pdf In PDF document text
    • https://renetravel.ro/images/files/ligejolafekirokabadunotal.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021613101049146.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612791cc6dc2c---kudefenemabumezoruboxukag.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f22da830---mixalamanuja.pdfIn PDF document text
    • http://thecuriosityshot.com/58122420171.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/topusobaxu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b32756ac5a3---gosubux.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2aaade51a---50779444197.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/nebazibepanewadotodabig.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/10763442989.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5281f186077a6435161262fae321db4d/9519588293.pdfIn PDF document text
    • https://edusfera.pl/upload/file/30235023733.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/reraxigemivurakid.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/74eap94mpl2imodh10i8au3a87/73301474681.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/pedukolirisafa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610118aa8872c---fudevoki.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd03ad5db---33848190913.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/sosizamafesimu.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/83149782640.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/4625600979.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/tolapasoraxonotokujogi.pdfIn PDF document text
    • https://manenshop.com/upload/files/18716783501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=taiwan+lottery+3+digit+resultPDF 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_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 10860 bytes
SHA-256: 79bed1e002c7f69856fac65596be17e53040679157a50a092fdc84159ea8b1c4
font_01_sfnt_off00012db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB2 18264 bytes
SHA-256: ccf78cf7981828bba86454d0868bdf68f535bfc6369df588afc7df0c0c24fa7c
font_02_sfnt_off00015ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1