Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f7dc776140149…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 09:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62a6e30738de8c79ed3aedab83749041 SHA-1: 12534143e63c7df311f0317b849e7c0211b2769c SHA-256: 7c9f7dc7761401494769a760d01ef9ac40d44bf7681e585d72fe4a4b6b391dcf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://picart-personal.pl/fckupload/upload/file/vodibolimo.pdf In PDF document text
    • http://christopherdallo.com/file/53671106348.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/bojabovedo.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/39813127630.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/71856049824.pdfIn PDF document text
    • http://bjjiffy.com/upload/12837552616.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/buxuwilitusibepesapi.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151080274634---65993808402.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/fegaviduw.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/49669467455.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161342247445ef---97035907794.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rn1kjhogscoo0osfem8v4ia9b7/bumer.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/rajetupemi.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/rosed.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/20610433417.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xotozufa.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/56386219306.pdfIn PDF document text
    • https://izometal.net/mm/file/18501145548.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/43267577602.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/defipu.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/78294732538.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/kulag.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/zomavakexizesizomenanegeg.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/sezomivedelaxusebegusa.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/11034669349.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/bemuvezibisegufuxo.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/39775058290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=top+antutu+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 18128 bytes
SHA-256: 8fa8769fc55779232ce349e96272b987f18b57d715ffda778ae6a6c625af9331
font_01_sfnt_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 10012 bytes
SHA-256: 8ed267b23a82efcf6097d62c3245d73417f565a9d8cf6e826a02ab4c07202075
font_02_sfnt_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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