Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2d833a91b342c7…

MALICIOUS

PDF

64.0 KB Created: 2021-09-12 02:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 631db4afe33f9eb1ce7bd11843e1fee3 SHA-1: fec1f5614e39dfaa23c085f5b3a5ed1a63e65b4b SHA-256: 5c2d833a91b342c78a1a4866a2357762b4f3452be8b173acb93d286c0e395e90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. ClamAV detected this file as Pdf.Phishing.Trojan-d2528dad23a95d95-10044376-0, indicating a phishing or trojan payload delivery attempt. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

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://ketchas.ru/uplcv?utm_term=ibis+paint+x+apk+file PDF link annotation
    • http://transbur.ru/admin/ckfinder/userfiles/files/66161608552.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/53897003825.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/72875768981.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/44120683081.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/2734785174.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5580b3f2---93483071428.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g3p3gm77eklk7ku6qro8chrnu4/64545570076.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210902031900.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/rasedobukemow.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/38475390664.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b60ce13d75---60137475225.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/soriwepazewedunibex.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a03faa97b7cc3b2fb8c4746c78886906/dazud.pdfIn PDF document text
    • http://pk.mo/userfiles/file/65493012480.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zenajobu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d279b98263---7799969195.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/25458202843.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/tibenelikij.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3615250cc---wutenob.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/53744585440.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6438a68780aad8fc9cf610e5093e7641/76705396.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/mepogafiveguva.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/55834839845.pdfIn PDF document text

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