Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b50b52e33a5f6d4…

MALICIOUS

PDF

62.2 KB Created: 2021-09-04 08:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f76d42857c9a1442a31a48a88bb056cc SHA-1: 2bc2c7c56d602630ef7d13d6c269395f4f3cd41f SHA-256: 2b50b52e33a5f6d496ab7184e68a5bc1f14ce023541255f48f1292e31ef3e25e
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and ML classifiers, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to various domains, some of which appear to be compromised CMS uploads or hosted on disposable infrastructure. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5046

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 https://crewmak.ru/uplcv?utm_term=electron+configuration+and+orbital+notation+worksheet+%232+answers PDF link annotation
    • http://cokhisah.com/webroot/img/files/16485383419.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/bulipoz.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jurenedatabuzuwisazef.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2aa14286c1---wezedav.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612b09b2da8f6---4503369335.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/22848369854.pdfIn PDF document text
    • http://klpa.net/userData/board/file/37621620329.pdfIn PDF document text
    • http://clingac.com/d/files/93908738861.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5ee9cb61---tafekugowizikavizezunoxap.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/1954f0a220a128cb70a330dbac5d5f8c/zobalupet.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/49d8e744f5f16b1430bd5423bfaae9dc/pavegujosepax.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/008a626e1943860380b8760aa85d5475/juwoperefujarofemow.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/16272f3c27fd2b2ba91a703de15e4c65/30986323535.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b20ea6edf---jejin.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210820031804.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/36376949537.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/76411752248.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091394758b34---39960887830.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb777e82ac---raluzitakopi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119e7c94678f---mijafusowuvojika.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/6293df9ddffe6535f0b2dbd7097ddbfd/55598892895.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14ae80a9a---33564233255.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/26675338581.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nibafabow.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b8e542416895585e1266eed19a79b5b5/bovanug.pdfIn PDF document text

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