Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ac7cf52ac5eb24…

MALICIOUS

PDF

73.3 KB Created: 2021-08-19 22:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9bd515f1536238c316bea677c4729d7 SHA-1: 3fa4faa70ac90fd4c0c6d34e119914e394f598b7 SHA-256: 84ac7cf52ac5eb240ad90b6992555b18499cc86213d80aac84307bbc5754af9e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF acts as a link farm, pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6485

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://araprinter.com/ckfinder/userfiles/files/wiwugenaxusupo.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afea3900cea---64196841009.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/5037656785.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/60024335410.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/jubogorufarulojixusizozij.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/nupexifuriwi.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/49547498961.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/96345321892.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/dbdac6232a4cad100ac98f614240246c/54211481958.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982551d256d---xikenoguzupe.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/nufaki.pdfIn PDF document text
    • http://alexandrapanayotou.com/web/images/static/file/56248870392.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/60912777191.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/diparowalodiro.pdfIn PDF document text
    • http://ezibra.pl/upload//file/95602583890.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/dokaduditoxu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec945de884---95777136967.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/9934743958.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/14419669673.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d35331812f6---38433831837.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d67edd3c8---rokamomojifudimawibiguv.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/76558892956.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vejomebutijirabozazexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+rank+up+fast+in+halo+reach+mccPDF link annotation
    • 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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 19376 bytes
SHA-256: f7a990f43abe5f4df1a429d29b2a393f0c2be72b0fdea5ae058c61ccb3c68855

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