Malicious PDF — malware analysis report

Static analysis result for SHA-256 575b1ed6f43e7bd1…

MALICIOUS

PDF

66.5 KB Created: 2021-09-13 06:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 720cae65f7fb0d8c6c34099ed278b035 SHA-1: 376699b0b6c5a4f42605733dc11fdb147f687501 SHA-256: 575b1ed6f43e7bd12719b7b2d7faa1c1ccc5adf6bd62ccfd3f5a1358c49e10fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm heuristic and the presence of compromised CMS links are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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://phuquiland.com/upload/files/93281924679.pdf In PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/52746207376.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/56695924283.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fewozubegajosemavokade.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/95240942740.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/61880078060.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/38410085740.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/gifebixapidetumolon.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/43557170927.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90085935810.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/varumajijasuvunenisunisig.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/86923657529.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138eabc3a48b---jasiguraroziriwa.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/74502826605.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090908020173499.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/kegenupekurigawuv.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/rizefasawiwede.pdfIn PDF document text
    • http://zerosquareonline.com/file/gebanavewokepus.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d4660500---67044252117.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/jorojaguzaru.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f7cc30d3---48958334651.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/girorojafolabiravuvonutel.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/68684284032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pixel+update+schedulePDF link annotation
    • 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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 10488 bytes
SHA-256: f8bf071259d4d62b485af78c5378b9466ba2e349ea6547b0cdcab5099e01d860

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