Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc54f974c26f0b53…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 02:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e092c1d332cc3445a6319c134152c7e9 SHA-1: f2211bfc3e2cde8edfb4ca8c045d39fe8d78b900 SHA-256: bc54f974c26f0b532ee41938276c107a01242272a7e3106bc54bd782cf851519
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed that the PDF contains a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect the user to malicious sites for phishing or malware delivery. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4326

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dermatologomiguelgallego.com/miguel/fck/file/99006476928.pdf In PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/tujojimaliniwimevogu.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mitipuwafuz.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/82681064081.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/3ca74333d61f43c37bf10ff18f0e1b44/7708114542.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/xonoru.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/bujurafuvov.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vazarobekugufan.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/mesuxubitasiw.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/72358826890.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395f02aaa89---pinunaxizixisoj.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/20978227232.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/84250997148.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/woxikisugimenagawut.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/suvidokudapo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614446ebef9a6---26980440745.pdfIn PDF document text
    • http://rivucota.com/upload/files/pevijewuw.pdfIn PDF document text
    • http://bptramptour.pl/files/file/3630100157.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/xodidupebobusifi.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/6585560724.pdfIn PDF document text
    • http://texmet.pl/userimages/file/71156579649.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49967330222.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vopabomafizozutebuje.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/piweja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+default+internet+browserPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10652 bytes
SHA-256: 5cfedab19b4a39a16e345d257840e05acbf22a033847826430c07b00c69a5633