Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74318be0715b76c…

MALICIOUS

PDF

71.7 KB Created: 2021-07-27 08:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb455cce8fa28b0f0e674d02ce7817a5 SHA-1: 74b93f1362ffcb9fad44515a0ff0ddfbe81f2138 SHA-256: d74318be0715b76c16f647cee557af8efdb7fb1226c90711a819d554cf63dec3
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to WordPress sites utilizing form upload plugins, suggesting it's designed to host or distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous links and the use of compromised CMS upload storage point towards a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

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 http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ntdf87ndoeqnaguffgn2gjhcm3/fufolazogarif.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f1508263---sasolemuvetujowugit.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd9c22b572---duzin.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d61ba0764---watepijuxalutilobi.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fotavixadasuk.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/punobovimuruzikubovuwo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/45570086782.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/51928367175.pdfIn PDF document text
    • https://campermagazine.tv/public/file/suruwil.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/zoruteke.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0578c998c0---76343743987.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/21518485973.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wosiluniripafemelaf.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8076163f28---dajapizinegatoxazu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869a7cb1c02---18226975012.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc207e3870---dubafeviwiru.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/loninenivafudogepi.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/zeguwagesimefiguxuni.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/9f51e2f82067425d42af4a23f0927c11/silola.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bibikapadosukawipeteponol.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/sexuku.pdfIn PDF document text
    • https://airbays.com/userfiles/file/95021329266.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9197866a006d1a6a96694c6f87eb87a2/1536846845.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160756d3596f8b---25254621914.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/52e0d21085bece59bac514e37348a5f1/88550345692.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/tarexuteluxunofix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=five+nights+at+freddy%27s+4+free+download+iosPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 10988 bytes
SHA-256: b521f98cd2e778d585561bc818df7ff6933d7a67492347132998faf4358c9af2