Malicious PDF — malware analysis report

Static analysis result for SHA-256 4362a1761924aa0d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 12:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5b9d38eae3ed12b02713b8f6385dd0f8 SHA-1: 8a1b2f0b97a1363c7f7e4506e28e0e474e2e905a SHA-256: 4362a1761924aa0dfa717a10b70f92059fcebac9fcce486339ddaabb9cd88732
132 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm designed for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3255

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 https://laborke.ru/uplcv?utm_term=past+perfect+exercises+with+pictures PDF link annotation
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b3c6ee49---62056289115.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gojukepuraniduvawesosi.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/miwopel.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/960986698a30a9170c8eddc5a668b277/devatijija.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/xajevum.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/fopobifesovobumojedutijug.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/saxomebosoxejekuvapi.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/99266984007.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///21285436487.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/zapulepopirebupowag.pdfIn PDF document text
    • https://luminex.pl/upload/file/46472975411.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/22727757760.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/aaeee770ab26bed277879b897dcaa8b3/pugisudijoma.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/469795.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/79172939431.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/32750040768.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/xigasan.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/98113769652.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202192151531773.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/55706345989.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/68255598457.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/73727795653.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/62577198643.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614232009d3d9---40096812339.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/93414577229.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 17648 bytes
SHA-256: 39ba0deafcfcec480c2a4647d2f5fd6f386a6fb3120af5a01085b91ad8fe6967
font_01_sfnt_off00012e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1E 10596 bytes
SHA-256: 9e212e71e53a6413d15d1fdbeba77d9d44559272de9a51940f2e31cb178e075f

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