Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b10862df0854ec…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 18:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49936f89d85a6caae60b2d64d015f8dd SHA-1: 67061ae95aada61fcadc85a3df1c9a0f33102a06 SHA-256: e7b10862df0854ec828c63abc88e73e60d3b3f995d675680fa9b17e0faea47ae
144 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains multiple heuristics indicating it's a link farm. The embedded URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and the nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161320a55d8c73---40126323344.pdf In PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/3450227868.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/76075351486.pdfIn PDF document text
    • https://guruvinodji.com/Userfiles/file/64327383094.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/1611774088.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/25771812159.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/25126456272.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/18545572403.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/69680504404.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/6985865711.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba6a9527a---foliwigujedirimefaz.pdfPDF link annotation
    • http://baraanduliaptti.org/userfiles/file/tevelijiwomonezokupe.pdfIn PDF document text
    • https://intersat.lv/files/file/gibawugavanazaxodut.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/nasetemudedujukel.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/93658992752.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/zakopijexopagigivi.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b46040a41---47434339325.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/jisuxelofito.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mjft1ajc6acvvsfamhh5k4fpqf/90672789324.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/kivefivurikagupop.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/mofejonarawef.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///23542691364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+strategy+game+android+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10952 bytes
SHA-256: 4bf245f2fb43203302c3a31bdc99c69783d01487047392f7b173507b5c00027b
font_01_sfnt_off00010d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 16968 bytes
SHA-256: 39f9515a0d1eb1fd9052b74f8f2b6aac8cf1b316f732935622a57633ea07929f