Malicious PDF — malware analysis report

Static analysis result for SHA-256 813c729ce3975277…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 20:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be7613334bd88d54d2f41d8a7158fe4a SHA-1: 2be2ab1db8c8c9344b6308949f4890c9eb0ffb87 SHA-256: 813c729ce39752776dc6df98c867dfcbd0d63e719d331d0502d01b7afdb6f607
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, likely intended to distribute further malware or lead to phishing pages. The PDF structure and embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6051

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://synerhu.ru/uplcv?utm_term=arc+welding+electrode+pdf PDF link annotation
    • http://aucoindeshalles.fr/menu/file/5964919000.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d7bb3bbc60cc0fb993e2cbb5b4b64e7f/pixonibogowuzaduxusosim.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3299119c---sulezisobipufegikuw.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/vuxaxewibakabimijojuwu.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/22/rosumakuxan.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/81c3937dec511420989b21a0c4d85e30/53122115420.pdfIn PDF document text
    • http://friulanapanini.com/images/file/tezobulusexofi.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/luzarutexumekuvogu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9d47f32bc5195e5435341258d4effe17/70277710728.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/50060137068.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4f40b0d9---vujunijadadina.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ihtf729f1io8jngu96igrbrupb/72108715761.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16107212b5a26f---telirukusiru.pdfIn PDF document text
    • https://fratellifurloni.it/file/vesafudabenadiluxelirogaw.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2761f861---muwediwejiliwudez.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/5o8f63ef399kfjk4o98k7e3ne3/60355285308.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/23921521803.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/98776922364.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/wipirod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/26241074892.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/27106398099.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6e8d0bac90679988129b58e38c1317d4/41979403175.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/judagalenikun.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/71132678170.pdfIn PDF document text
    • 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_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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