Malicious PDF — malware analysis report

Static analysis result for SHA-256 621c91ee3fc5b490…

MALICIOUS

PDF

54.4 KB Created: 2021-09-29 07:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7c411ad2b8aacf2e961607e4af4a7e7 SHA-1: 7c3d2924be07945c9ad89ef91b0ea4b9de771bdc SHA-256: 621c91ee3fc5b49051d3cf1fd5089aa3c174e1c39d709d7280b7d394dd15b3d0
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8288

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/gobukiradotokonedapagide.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-21/20210921050710214908.pdfIn PDF document text
    • http://pedraferro.com/files/files/77205915516.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/veziworagekuborebek.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/medigobogamid.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/86674586511.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145816a0c344---26433958531.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/30574862892.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/zuzegakawiwog.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/75281285911.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/48297548654.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/49377892960.pdfIn PDF document text
    • http://chamdure.com/DATA/files/lelerozitadunib.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/favejezoki.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/17380136859.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8e91c79b400a563d4cf8bd9f7eaa3465/bivirotubax.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210914_031836.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/sikekesu.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/57685048801.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151da3665d95---99817448028.pdfIn PDF document text
    • http://93564497.com/userfiles/mizufomokofegemevipopasi.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/rokak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+access+android+system+files+from+pcPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 17248 bytes
SHA-256: 88cccc86eabb7c6adf0d89782e50722ffb37bac6fbcd309b6139cf9ccdb9da43

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