Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f6022551ea18b5…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 10:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad665df2881c8e8391b1b3bf85bedaa6 SHA-1: c99d1565a20908fdafd9bcd63cfa1a97d841b848 SHA-256: 28f6022551ea18b59f7cc40587c40080a778c036358ce506f871035af4651955
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a phishing and trojan detection. Static analysis reveals it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to obscure the true malicious destinations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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://cephedanismani.com/images/pages/file/gurosuvitodur.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e9ff4f1f3---newezivitefedanajufaxomug.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/15158897835.pdfIn PDF document text
    • https://ms01bet.com/contents/files/fomapasimupogo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/36852597146.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/97843368136.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/61328110883.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/vifonozepaxadid.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/vajulag.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/turotep.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/88676226227.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/pekezuposexu.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/fidigewafamarawexosexemof.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134f98557734---65245805720.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/tutavunarujeje.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/59204280903.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/33596769552.pdfIn PDF document text
    • http://boxethai38.com/upload/file/63638493989.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/39175687875.pdfIn PDF document text
    • https://esz.jp/img/editor/files/valowemokabowugumafa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3193303a3---47359825564.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/wulesodamegovuponemezid.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/68932969258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+wala+game+downloadPDF 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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 10312 bytes
SHA-256: dc1b7d4927c74272f6d0cd6a610dc49c88b9298bc0f378d3fc7feb7a5d837cd1
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.