Malicious PDF — malware analysis report

Static analysis result for SHA-256 18edca9e1611a4e7…

MALICIOUS

PDF

105.4 KB Created: 2021-09-01 11:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5073ba0410f17400cfbefc9b31d2bbf6 SHA-1: 2e871a84dfa1e455425626278f64ad406d56de6b SHA-256: 18edca9e1611a4e7382cc12a8aa0a53a0ebf8d7bb8a786db945970740b38dd1d
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6530

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://archism.ru/uplcv?utm_term=learning+ext+js+4+pdf PDF link annotation
    • http://syntra.pl/userfiles/file/lupobumigakuxo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609da19760623---64149787490.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/66725530244.pdfIn PDF document text
    • http://candientuvibra.com/images/file/56271173080.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafae61e0c7---jenerewefumanuxi.pdfIn PDF document text
    • https://drsaman.com/files/38244050144.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ja9l0s4sg3fhhjpag3de5k73ot/kuputaxegoze.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/36987830517.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899baca91e5---80605525463.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/50856725746.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/jazupi.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202162817330.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/51bin14to2v6oj627vesf6q48o/mojexuvi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25691e84e---47185219839.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/6766578137.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/piwixadetixenowowajapiju.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/kipofofetos.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/mikopi.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/19962101657.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/jigutulesizamos.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/84640013512.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/97207364669.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/rivapax.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_off00018c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C89 10772 bytes
SHA-256: 992752f77b22fba77c951a206c7e0afef5fec49be1413a88f5a7e6a4367eedd2

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