Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e10b9f05d9557…

MALICIOUS

PDF

58.1 KB Created: 2021-09-16 07:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f60de5f628beff8a43c13106f1594b0 SHA-1: ec70a5e7ff0fb696a1fa0deb4b624b2123dd335b SHA-256: 4a1e10b9f05d9557b8cb2e322aedd6e819b807645a702cf0ac20c0c99cce948a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to various websites, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7240

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 http://nhasachthunam.com/upload/files/98115342366.pdf In PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/550180202.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/zakogejedibolep.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/juxoxamivogeta.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/7120938216.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/puwaxojat.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/tetux.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/59656822711.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/19732143652.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/65119425927.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jolitonuzapumuw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2e1f18c6---87560808891.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/45162085725.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/33954797705.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/97259139297.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/bilokixota.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/53600317477.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b7daf9c6---93656744457.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/26572163900.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/46317087326.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/90804129671.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/23773203846.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe141ec6b---dosopurovarelipapunubutag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+print+to+pdfPDF 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_off0000af68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF68 14424 bytes
SHA-256: fed19ef1bd0d2d6fc44a896e183856c54aeaafe8c8426eab6bc1667b90ef373b
font_01_sfnt_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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