Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e57e236d6c2200…

MALICIOUS

PDF

81.7 KB Created: 2021-07-03 13:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: df7847d8e603c0c39888a348a0e5088f SHA-1: cd1cdd115c3a462cf3a5a309be533949b181feb6 SHA-256: b9e57e236d6c220063d474e12139a8ff3162ed45a6f1f5799ebb7fb7ed7b2524
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.2404

Heuristics 5

  • 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
  • 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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o6hgn97rgjllkossaok7meq0f2/gomuvowojifovidukowor.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160872d3aba03b---bamavoduwazu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/u1f566brpjub93tlkobtsnkqhn/95216165344.pdfIn PDF document text
    • http://www.celso.org/download/lexadi.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/voganudadolidezid.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246a55f56a---35785960934.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/18842280215.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0695cb7550---vadegazorinimagoged.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/76451560843.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/bavatalotulagirobumose.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df79f3f9e9---vinaxegevuze.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/72482617526.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f5ae25f6eef41e5c245e0b1a905c99b7/45407795876.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de497dca8---76457196210.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/b5mjf77q8bmjpaorqqsrrug6b2/mebopovoxekeburatepis.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/mirafowefibigurupimak.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/08a4f07b08892ca020856a074e0b53ab/depifowozosawadibavax.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/40524303536.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/44512696650.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4d432d796---saxegifimivagizafamadixa.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/41051108528.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/kilibazajejufuduwuleju.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/6011575760.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/91239676090.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/743062ae8d0ccc3c08f5734015c460fa/35001711186.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/bujakugotumapiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=labia+minora+swollen+and+itchingPDF 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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 11000 bytes
SHA-256: c898389f0671c9176fa91905dcc4d0566522206e5cb181df90c64f3100a8c84c
font_02_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 16400 bytes
SHA-256: d284ad6e8e14b05802a55aa790a1add33da70b9a30682296b1b12f296266554c