Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5eb060544a5dcf3…

MALICIOUS

PDF

60.9 KB Created: 2021-09-20 17:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a1e85f86cbfad76bd6fc8d7451a4da0b SHA-1: 87234795b06abb19ccb1f98a88dc52bc31edbe24 SHA-256: e5eb060544a5dcf3cd3369ee4a0fa649477c44bd16b2387b407d17b60e4d06eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which are hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6233

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://kamwalibais.com/userfiles/file/popavebemaputonedozogivam.pdf In PDF document text
    • http://ceroki.com/image/files/xukasejigazosedufetapowik.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/38293331301.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/lubisezamo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475fceb7346---21852947425.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/40455546454.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/powuborupebasa.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/16732439835.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/gomolofiwutugawaworagej.pdfIn PDF document text
    • http://teplospectr.ru/images/files/35305594994.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/nibefanof.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed09d1ad5---12035744469.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/soxil.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2aadfdbaeded92fad7d8c6ceb5cc4a0d/79649336439.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/81311764930.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/29503189869.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/pilirabavolefadefaniluluf.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/28882089981.pdfIn PDF document text
    • http://imaginove.eu/data/Files/50717391348.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/19778321261.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/vonidibapikazo.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/wasezesimidufewojewapup.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/lurepirefijiz.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7138aa26ddf79387a7db845b3c872c5a/18862891186.pdfIn PDF document text
    • http://thedreams.cz/files/romuk.pdfIn PDF document text
    • https://cet.sk/res/file/ziwotegurejapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=grand+2+custom+romPDF 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_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 10520 bytes
SHA-256: 01598dc7a43343656e88044226a246720b76c4c22cc91ae0c7e814de15ca3d3e

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