Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79b4cbed0d6fc90…

MALICIOUS

PDF

83.2 KB Created: 2021-09-06 11:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c33038cab14153e0442ed634a2e4c785 SHA-1: 9ca7e8847a4cb28035f22879726162afd66bd150 SHA-256: e79b4cbed0d6fc90325015e74d5415876bc44510a212ab0f7ad1465359e803de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a signature indicating a phishing trojan. It contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to leverage SEO tactics for malicious redirection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2639

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://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982559b7761---25277548172.pdf In PDF document text
    • http://oasis-inwaste.asia/files/file/68841052186.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/vulatepe.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/gaxagovijumikatuxuxaw.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/11156420200.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/karidulobutesiwife.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f63a824b---kejeluzolowatomazewewa.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/86540688602.pdfIn PDF document text
    • http://airmon.hu/images/files/43400382631.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pozowewomovomijova.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/54854500461.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572b7ebc2e---52180500428.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/dawegulikilabefanosini.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9849954f6e60bb7e493df16179881204/87782046796.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072006172580554.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f144aa5cab85fa9c19e60cac6e6a896d/xelimubezipafile.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9f688ba977ea3892b618be4bd64370b1/nofolutujeresi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/iogh0sgtaib5ve1vjcn9toipo9/94273296816.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5954eec778c4a0600134daa48cf3d0c7/49404854009.pdfIn PDF document text
    • http://charivne.info/images/file/luridutokuzemif.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5jr9159udu0bhscdf49095umda/dawanelaxukefisidulox.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36ef7b09e---34314693703.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6apligssojt24auo8u5i8d0fhe/tevebuzudulesolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=spring+boot+2+books+pdfPDF 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_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 10760 bytes
SHA-256: db0c75b1f5f5c7dbd1927b5bf3c68f3645e3604ed76af6f587ba590949591e01
font_01_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 17368 bytes
SHA-256: 053549a420555ebe368b543d54193ac84b17fa82f07bb94ada23dc7322b91418
font_02_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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