Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7231327cb97c3c5…

MALICIOUS

PDF

69.3 KB Created: 2021-07-03 13:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 981965452b47692990b1a0b6ef34d555 SHA-1: 39ec44964cf3853a7cfa19f2c8088821b830d92c SHA-256: c7231327cb97c3c544c6170d1d27a95ab15f8c987036c10bb6c54e3df88858ab
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 numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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://garglob.ru/uplcv?utm_term=wireless+communication+questions+and+answers PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0bd87de9---birotefivadoxojulobubus.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/jomuxo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/96473916727.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/31441175975.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/81629258875.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/7gkvr9mgvjddjp9mug5nh82i67/74919332652.pdfIn PDF document text
    • https://codecs.ro/images/file/55904745472.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210613092913574.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/33b4505828a342c1abf2d3962edbd3f1/84339883280.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/likedinedifenadokexafiw.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/tj0idd7ns0td9ondk1ob0s77s6/manevivadezobinuri.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d0d4e517---nikemuwopuzis.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ee73978127d4ec02bf9025dc721c66d4/nikuwofud.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4452f2a217de74b8a6c924e0e113b0e2/vedumijoseki.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/83195402867.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/294d942198d5486d054f83df5ef21312/82428410495.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/00aa381921469eb0291797566fc8c9b1/28153690384.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97c50d61a---54982369759.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a26f45a41---91440194485.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbd6aa5044---36368907913.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/delusebekegiterune.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/42364983683.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/a0gevimutljnbjg3kt2p1uj82j/jifunosa.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/19472226943.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_off0000e636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 17064 bytes
SHA-256: 0ea20150d3fc44e1d2c2e822348a8f0664244a57f75781fb5a616226aca82384

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