Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a79c9378b09908…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 05:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f60553dcae5f80b0387c5fe14e6c1ff5 SHA-1: ecf5998f7a619f1413b06f7a8e93f54ef49cb0b6 SHA-256: 36a79c9378b09908005d7bc9e2d5adc92eaa6588a81856ddc85c264c7ccde28a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The 'utm_term' parameter in one URL suggests a lure related to 'inshot pro hack ios', indicating a potential phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inprovitcentroamerica.com/ckfinder/userfiles/files/zisurejovabupebuz.pdf In PDF document text
    • http://archifolder.com/userfiles/files/66666870866.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/7344446261.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/falajuligamasenegabe.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/mipajajen.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/27820792053.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/55190271374.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/76118891855.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/891a4bed6ade8c6d616e117f4ceab742/29543173513.pdfIn PDF document text
    • http://terminsk.by/pics/files/56132338700.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/28946471687.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jatib.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4f434f01---familalanigasezogozupiwe.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630646572.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/9285213709.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34233021123.pdfIn PDF document text
    • http://theponghop.com/upload/files/mezutevezosodibefujomevo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143307991811---ravesakakuxokupaz.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/vuwulumepe.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/44037878263.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fetebidikeduripuzunow.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/liwinegaxotosadij.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/36149215717.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/nexevevabozesosilulukif.pdfIn PDF document text
    • http://belniig.by/public/file/sugumatofakusuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=inshot+pro+hack+iosPDF 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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 10336 bytes
SHA-256: 34e1a81b6f7c50898637a3c23a8e96256d12843f0e36b46000622a91aa8d5138
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 20748 bytes
SHA-256: bf53386536ca8d41aceb9fde9c677ef36c73338b45f48544bd08451233b6165e