Malicious PDF — malware analysis report

Static analysis result for SHA-256 57edba8fe8022ee3…

MALICIOUS

PDF

66.4 KB Created: 2021-08-18 00:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae3274a9d690d703d5785bebc6fe1997 SHA-1: 54a69088a0d1ab77be2785f65dea6c3d325d3d56 SHA-256: 57edba8fe8022ee33b838b24f73672fe47aec843f831eef36785e45f49ce431c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also flagged it as malicious, supporting the conclusion that this document is used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8521

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://blnk.eu/userfiles/files/98231260031.pdf In PDF document text
    • http://martonaroniskola.net/userfiles/file/46663108633.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/97932878178.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/279ced279b3bac6f70511d8e8867ca22/59443727629.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609423d54d150---4803971318.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/57694306881.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/16ii2h32sa82aggsp42ftf9p87/sitamezeguki.pdfIn PDF document text
    • http://hadt.vn/upload/files/56865757695.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a25cbebb3---biweguwubobozosotigusi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/93985181398.pdfIn PDF document text
    • http://headrepublic.pl/images/files/25467023277.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/52086328542.pdfIn PDF document text
    • https://yellowstonewildlife.com/3613105853.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/rekemirolemapafiwakusire.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/bidokefobugo.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/70337895569.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c79373bc---bibofozimujunumadunute.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gupusal.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/79464097806.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/femuxower.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/24652126113.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160949de853040---32226148508.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/20379188929.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/91407723216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grammar+practice+workbook+grade+9+answer+key+pdfPDF 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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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