Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a4a6f15420255e…

MALICIOUS

PDF

60.9 KB Created: 2021-09-04 12:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 734253bf4ec931880be358569aefa3a6 SHA-1: f8d305d0d76eea814ffe5ef249e8b118733fcea6 SHA-256: f6a4a6f15420255ed9df093669260a1f083b9a9bad172406b2e403fd2525094e
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 websites and disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9042

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://mwasafat.com/uploads/files/vimabakasewomulefijis.pdf In PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/39035668445.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/qj9gr1ktuhj6usklk1ae5jhq21/94309386791.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1660df1382---tiboja.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210529_B6C68E3758E2577B.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd5ea0617---sedevisenuwoxufifewazo.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcb1e178a9---vijofow.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1bf134f4---sopekanusedimidedozamaduz.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/dasolupasoxaz.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504183534173097.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/74411742015.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070ceba8a246---sogig.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/437d7d739196e666d2d8e9f3d27d14d3/17490688289.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/24397045760.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/siwekerapepalozuxemor.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/55914519849.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/55225493405.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/notawedumegemagexuzapimi.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/22208260869.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18447cfb2---44877946027.pdfIn PDF document text
    • https://tsegypt.com/file/92374042868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ford+fiesta+zetec+2011+manual+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_off0000b68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 15620 bytes
SHA-256: 2f23ea8d0f324f5101783f4f7ef479c7c65b9c1418093e94fe77c5819e6dd63b

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