Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f00e3c66850cd8f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 00:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e64d2d15a7d7772db7f8097ecfdb94dd SHA-1: 1cbc4654f5cc9811307375dcf871fe70f833e392 SHA-256: 2f00e3c66850cd8fb8750d15a9e6299b40d4d7ffb729b811d2349448d51497b5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document exhibits characteristics of a phishing lure, specifically employing a fake CAPTCHA to deceive users into clicking a link. The presence of numerous links, many pointing to compromised CMS uploads or disposable hosting, further supports this. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a secondary payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://www.zolmedis.lt/ckfinder/userfiles/files/35985427914.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/sarepezubonazifibiwixiz.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/jowoneb.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109062101026727.pdfIn PDF document text
    • https://clickbox.ro/images/file/41224506185.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/16764680668.pdfIn PDF document text
    • https://hobbypet.cz/files/file/pojavolelofuzawem.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/ramefisarumat.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/welemenusazukunarilokedu.pdfIn PDF document text
    • http://online-cycling.com/files/file/60617659485.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a5af276---9342175787.pdfIn PDF document text
    • https://profesa.net/userFilesfile/zigovupinorixupurerazupu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ik378te3c93aee01rk6iq1os1/xotipojixukox.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/zetigelawigur.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/lokololunotadimifakuxoj.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tumamo.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/057f240d0e91304e977d50146f3152dc/kukojeni.pdfIn PDF document text
    • http://devveb.net/userfiles/file/fanilozilolesadojufifelem.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/63745643279.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/punigawof.pdfIn PDF document text
    • http://wjcopy.com/upload/files/kafedinemuluvirerax.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/50380380187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+sword+apk+download+without+verificationPDF 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_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 11232 bytes
SHA-256: 39dfa9323d1250aa89fc35c8011cf96afbc3add6495dcc793d94f7e6a458b22e
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 18164 bytes
SHA-256: bfd8f6973bbef14a166f64886385de27d82ffe582eba561bfa43b0b5d751a9d4
font_02_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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