Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3760a4dfa6e619…

MALICIOUS

PDF

55.3 KB Created: 2021-10-03 07:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 504a2d1944c3c336fcd8ad6dd06d77d3 SHA-1: 4f68ba1519028f3552e91cff2f757b0a5c89e00c SHA-256: 8f3760a4dfa6e61968570b9da9761b04682de18f5be733c492b899d03bf1278f
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's a container for malicious links rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4703

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://huntic.ru/uplcv?utm_term=seeds+have+been+sown PDF link annotation
    • http://studiopedrazzini.eu/userfiles/files/70778681683.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/4461883627.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hhk43hbjautdppgstf4e6716u0/nurat.pdfIn PDF document text
    • http://sdes.in/uploads/fubejuki.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/50370840537.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/lukoroximovabiwodajojej.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/ramifoxikobuzepegopegenub.pdfIn PDF document text
    • http://land89.com/ckupload/files/doworinirutapadizu.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/sanupapesogaram.pdfIn PDF document text
    • http://0048.pl/48files/file/terig.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/gopowilikuxamiruwu.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/fifasopos.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/bajam.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/57188359463.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/xalovojibabonezovap.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/21205894682.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/lososobozujozeroredolo.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xabitusowovoturur.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/61922556148.pdfIn PDF document text
    • https://steammining.com/userfiles/file/dikajavuwenuwebilov.pdfIn PDF document text
    • http://pasat.alehotel.pl/userfiles/file/22561390718.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/gemaziwanuratekunalu.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/ruzavoxag.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137a45326592---41418362836.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161508d0b4f798---14284049562.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///nimelufet.pdfIn PDF document text

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