Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b624b9222f7f6b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-01 22:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 683fef267d7455d9d7baef2b34f49f66 SHA-1: abff4730a0b293f7981260ea4d0b1a14b1de4581 SHA-256: 98b624b9222f7f6b29f6327aa32d96c010cb8f6c00ec99654bff591ea54685a3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user. The presence of multiple compromised CMS upload links and disposable hosting points to a sophisticated effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9405

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://crewmak.ru/uplcv?utm_term=the+far+east+chinese+inventions+and+discoveries+crossword+puzzle+answers PDF link annotation
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/nowenigelexezufigobifup.pdfIn PDF document text
    • http://gardatrans.com/content/Files/sunazokovunekip.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1164cef9ffbffd1b680ba4b40432b716/40877237962.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074acebc9fa1---pobutujanapukepetetaforaj.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/fdsjm41hoe57mqbs4ipnage1c6/wofisopove.pdfIn PDF document text
    • http://uco-kampen.com/media/files/16198485856.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/82477696038.pdfIn PDF document text
    • https://tavio.ru/files/file/21127593980.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/988e238b288558ddadd5533baf12c88c/40741012641.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/448846b9b0dffeb5ea67d9a8e4d53695/2429564170.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608034838aeca---85181205199.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/gitebatibesuwuso.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/7655751817.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e051f5fc82d37e6d3d8b2a672199360d/56749166373.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/dql54gc088cvdapfikl5vleic1/14219483390.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/22500087207.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/vitezi.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/kanebifawemukorefijebuduj.pdfIn PDF document text
    • http://isleo.com/i_photos/file/wazelilunukadumisiludu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/52477097409.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/turupovifulewanomiwo.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/4cljv4k4ab02e24qhfq54iuth4/931004058.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a0031b73---29950248706.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/semalarenowatazefubu.pdfIn PDF document text
    • http://armanetti.com/images/zilelezudugixazemeker.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_off0000fd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1