Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53dc8aa1b86ae8e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 01:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d375b638217b2b201768e6187e35cd0a SHA-1: 31ca1b6c3845b41dd085b6a4a2111e2602acd7a3 SHA-256: a53dc8aa1b86ae8e585d5c49b178c472863597a1f8016ef74087105bb539c1ba
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly indicate a malicious intent to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6693

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://drentmedischadvies.nl/uploads/files/levotefesoxezeteb.pdf In PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/zurifuketiwemujulazoxura.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/69735646049.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/81872148468.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad750b7ac90---26008483448.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/jogekawox.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c893f071fb---53507533761.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162321456821.pdfIn PDF document text
    • http://technocom.pl/editor/file/ripitedevotavajajuzu.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xaviwedefalomovotivid.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210715230517_wh13m0.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/losikijaduralakipekikono.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zawasamitugokukemari.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/34343464968.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/ac1434dff6addb5d9304cb677fc188b1/31862102176.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/gatagifanigariwave.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b4db1f9a---48999687220.pdfIn PDF document text
    • http://irinabailey.com/upload/files/71858501021.pdfIn PDF document text
    • http://myphamasia.net/upload/files/busenenalejatadizotado.pdfIn PDF document text
    • https://htchninc.com/d/files/kogufozeguposimexoz.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/zowapiginesejube.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/85911435495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mathematics+attitude+scale+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f6a09af4e4a0a60552a3bb8705706e05/12581988280.pdfIn PDF document text
    • 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_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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