Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f1cf319717d940…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 11:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2ccbfa077984d2da611920653385489c SHA-1: ac3b76442dac3a35894a3235d4bb65102a9c70b3 SHA-256: 13f1cf319717d940aeda7f586d00b9539177d9466b0d98e653e8ac81c605b7c0
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5455

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nvkhg06gonjhonl8uukmjh9as2/95707662396.pdf In PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/watexupifuwuwap.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/gopafomisukebowuxarudumer.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/48251494541.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/23236445191.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/pagugixevanidokojumusuge.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/gifakiratuwogevozoke.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161322d62e14ad---sumojuxemuwop.pdfIn PDF document text
    • http://temple.mo/userfiles/file/55301333490.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kalepuxuta.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/toximeporuzodi.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/vadupetazupusovavufekik.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/6302284371.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/97614275551.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612feef6382f5---16779826179.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/46423467334.pdfIn PDF document text
    • https://onecre.com/images/content/files/poguxuputixuvoguwulumogu.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/6947562601.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f550926f1---kafanufifepowaxaf.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/19215599403.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/30115298703.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/9961352968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=edjing+mix+apk+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 16844 bytes
SHA-256: 70e326ff544a3b24d2bcbffe00a936d21e6892675735ffabf53b653e254d8838
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10632 bytes
SHA-256: fb0592be1277f0a0bd1ce98b3022569c3d91f7a9e88b38b8262f989f203ae165

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