Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f86ad9cd4fdb40…

MALICIOUS

PDF

53.9 KB Created: 2021-07-04 22:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afea984561dc42b897c12b2b344ac76f SHA-1: 9e8883f3a20336aa6002b0a8f6896905faeffb38 SHA-256: 15f86ad9cd4fdb40667de06692a8fe733f4d4068be740ce430614906d1a3a590
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as a PDF document containing a link farm, with multiple URLs pointing to potentially compromised websites. The ClamAV detection and heuristic firings indicate a phishing or trojan distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4912

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 http://klimatyzacjaradom.pl/userfiles/file/92369659323.pdf In PDF document text
    • http://jirehenl.com/userfiles/file/071557094600.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210621171239.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44193736ec---81494974232.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/banuvimokadumonefolu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210627191112389733mbphg.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/28458539984.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a30235f2978---74641255910.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/sorub.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fr2p1vvg7fj8meeceiu2vur3kn/minefivosewuxokuvuxipuron.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada201794a---4774519967.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a991324d4e4a02d1bb0ef7457912a60a/vizafejiwazoxozew.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/67920347283.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jj6dcdaqmbhu9dqod3sea7leuf/turaromofuworok.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/5dgbt0d91m4p36m90nhhlhcl2d/mewugado.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/392611d1040f7bd1386dccad3a2f56d2/jaxewizifusigu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa359352b57---97611268429.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/buhhrpr6u673d17b9mvseohil4/95894224400.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c50fca2001c---79018132680.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/14422915042.pdfIn PDF document text
    • http://envigest.cz/upload/file/dewipotexajino.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/zitogazidekidimu.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vosezafuzesoperizatato.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/muluref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=displacement+reaction+exothermic+or+endothermicPDF link annotation

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