Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fba9a39f1a2acea…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 17:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6511967c95137e25edf7cb3812277fc SHA-1: ee5fc65f9f5694c85cdfcc8ef5158bab7942f0fc SHA-256: 2fba9a39f1a2aceac2efab7fe3f9f995c8a10f36751a3159d6c8b423ce8d46df
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The ClamAV detection and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a malicious intent, likely to lure users through a link farm. The embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lawtutors.co.uk/js/ckfinder/userfiles/files/mawitotopox.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6574d2ea04---saxenebibuzujexelulodob.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/54855239101.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/35742565001.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/dejujapazabujawoxuzafaxa.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/mirel.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/58308345252.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/bisimoderixutakig.pdfIn PDF document text
    • http://erpos.sk/data/files/banigamozufamuzikironivaj.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bc3b65c1---fixerivuputefesunefuta.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/mifemejabidisepiviruxeneb.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/3e0a27299cb400cfed4e8b5f16da6ac9/85045704305.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/rorufutewup.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/752297941.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vl0taf21niek9944k2dhcp1nsf/25642522231.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ebc5d7935---69490080226.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/58753263604.pdfIn PDF document text
    • http://vizcsap.hu/files/file/mokunuzaxejozezoxu.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/81bf96e20d7f7f270fa12dacf29292a2/bozazo.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f78a289b8ea---81754860140.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/bivowaxizokupefax.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/pijoji.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dabbe550b---82949065409.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/7dde1177af98307ee1f041c6abb42eb4/34490346772.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/dariruxuwenagodudaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=informational+text+5th+grade+worksheetsPDF 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_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 11164 bytes
SHA-256: 62b03cb2fe0af7abc61455ec3eebb2bd31f7e727eb14c6205d4d9562fe957fc0
font_02_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 17552 bytes
SHA-256: 9b76cd8768ed6d9da4573d8ddf33cd67833729aa6e4c823605df61eaf7f3fd58