Malicious PDF — malware analysis report

Static analysis result for SHA-256 855e88cb139b7080…

MALICIOUS

PDF

81.3 KB Created: 2021-08-01 01:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e7def9db0461a22469d39ec6db0c5c6 SHA-1: ee5d2caad6f4779ab26e7fe61921ddb654d4241f SHA-256: 855e88cb139b7080b3b6e348d4ff3ea56b69747f5e4744d38d364daa49142442
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this assessment. While no scripts were explicitly extracted, the nature of the links implies potential for further malicious activity upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6435

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://lienlacanien.com/img_pages/file/36908610086.pdf In PDF document text
    • https://cornerstonelaw.eu/userfiles//file/wifofozuvexamive.pdfIn PDF document text
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/36483876889.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/elsfaj3egmhvkqoenijrubqnbb/kulamuxijasetemesafimidek.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/fuxesibuvofap.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/cq1sn1det93n1nieujnb3a6ecq/busanujewekexipobiwasegol.pdfIn PDF document text
    • http://hk-keber.de/images/file/81670630212.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210629125746.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/76d31e3e9da265fb4a3010ae99254b08/74172080919.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/tagofasunameros.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/941990204609ad301902b3.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/67673037595.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f5165326---vujotu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087694917dcc---58579808633.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/loromimozagawu.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nugexudoriruke.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9d25de52c1bb22fd43e380d77a309b6a/kopupozex.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/fifokutunetojasija.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/43740954508.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/734bd248b5e199c300455e48446b7442/vuvaf.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a115c3eed9---mironazenivosubuzewot.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e1289f6b---jizoris.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/80892512685.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/julifogititarakatafifu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/nktqdpi1kpqprtnjghknatso17/31318678239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+use+a+blood+pressure+monitor+cuffPDF 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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 17296 bytes
SHA-256: 316265f3790a0ec2e56dc299207c015ee11058c1199a4d303dd9a233c5cb6fa8