Malicious PDF — malware analysis report

Static analysis result for SHA-256 e133f90ea0f7e0e3…

MALICIOUS

PDF

64.0 KB Created: 2021-09-14 05:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7fbd7cad7b6e3513ea8302d9af8fdb8c SHA-1: c2a513ae9723ecbb023108b0c5ff3f39902974f2 SHA-256: e133f90ea0f7e0e38cb6540b36bc3696e1925150466bc0e4f8a1fd7d34d35bc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. This structure suggests the document is designed as a link farm to direct users to malicious websites, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8288

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 http://www.recko.ru/ckfinder/userfiles/files/81691147166.pdf In PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewegosijurekirezajeli.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc43fa0ca3---dofirewu.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/32587812067.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1561746605.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/36339387103.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/79257824587.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/74434427362.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/92131729030.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/jetivovedejedenewubunawul.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/44355665035.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/67095700222.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/saludewez.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/70641726562.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/bukipexasotovivenol.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/66292040501.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/376aa6965913b44256b9ae7a87974bf2/70367701967.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613632caeb07c---vafaziporuburujuxazodi.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/75159656719.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/36148211300.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/jezatosiwuvesem.pdfIn PDF document text
    • http://speckrepej.com/upload/file/mugetixutowave.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/3790585711.pdfIn PDF document text
    • http://sdds.be/userfiles/file/59547971540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=galaxy+s21+ultra+vs+iphone+12PDF 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_off0000bdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC5 17112 bytes
SHA-256: 61f27557d0254e0e56138535a954a89107e08b17ab38ae481b5b5a63b1e66c90
font_01_sfnt_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 10944 bytes
SHA-256: 805b243ec114b5dc518014720ce75428830d9056ad21c4e76bbab9d19b14c304

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