Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a91c0848bd6145…

MALICIOUS

PDF

62.3 KB Created: 2021-09-10 08:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e4ede1f796bb4b0f59ea5f41bf45c3d SHA-1: 10c5c68ff2e0c3d2bffa91a47e000e00f25463e8 SHA-256: 75a91c0848bd614536e5f7d5f28c0307f56c226fbfcfb77ebc47105552938327
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5125

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://s-privod.ru/userfiles/file/20331521979.pdf In PDF document text
    • http://pijntherapie.be/uploads/files/10738629245.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/ridoluxemefawomonisimilup.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/salozoviro.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/teguvibusaf.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/80610056985.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f521d243a68aa2b528d526c9c3b485ce/89894265279.pdfIn PDF document text
    • https://edusfera.pl/upload/file/vemijibukilemisajamibame.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/2605963569.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/53310859525.pdfIn PDF document text
    • http://tion.hu/upload/file/pazorigebajusazaz.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vupakutexunuwiwezedo.pdfIn PDF document text
    • http://dmkert.hu/files/file/97254074940.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/dukawafumit.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/tupewodefuwirilo.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/palinevinusaxudage.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/91508282161.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/kuverivujaxiwotagesanama.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/tosarowukoramobesi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613630eeb56ec---5674966137.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/niwuzefepiviselumuwoboki.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94993688272.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d53f2dcea---64331362207.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/fubamosujujizi.pdfIn PDF document text
    • http://e-sportis.com/images/upload/88284848184.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/beputebunof.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/gijovaxapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+tv+emulator+onlinePDF 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_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 10388 bytes
SHA-256: 1a0d35feda72138aa2f7d52ef080aaf2b3759f47daa3b433f10cf35df8863ab0

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