Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1603eb4aee3002b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-09 02:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 935549e0f5c6c51c39db55b2237435f2 SHA-1: 07450e2f5740de18c904d471c2686fbfdff8588b SHA-256: e1603eb4aee3002b3ca89f1e62cde94c7c69d2e5dcd64c080911e8918f05bfe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains a lure related to 'Cd key idle heroes 2020', implying a phishing attempt to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://cructi.ru/uplcv?utm_term=cd+key+idle+heroes+2020 PDF link annotation
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2966738c---99669789646.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210520054205.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/19c3851a28b9b09bcce40ad9cda85aa2/duzinozowamoge.pdfIn PDF document text
    • https://reniuved.it/file/zirizebug.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a153ff2ed3---bumev.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfda85d963c---tozukoxakurajozilereto.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a3994540---38731081990.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160863146ef2ca---gorajojadutolimexe.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/metofenapogekogibusa.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4d7ed6a0e7be49129ae64dc947d3578b/tukijapuvo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816410f11d1---giferejorufiguf.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160911b3c3ebf9---niniwigurotifilipugamol.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/bdde78140d6eaccc23a69e8e12d098a1/40711635531.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/xosukefeliletinixagazakoj.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/e3a3426a1ed246566648c77d4b201947/koraz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 5048 bytes
SHA-256: db75865cc1f23736c80d6a0cddb7d03298135fc89cb0ce2fb7f02bf69970c712
font_01_sfnt_off0000fe1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1A 10848 bytes
SHA-256: 14e541ab262359bfebff9955f656f0089b1167d77c9b85f204e1c1b36810ed7c
font_02_sfnt_off0001232a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232A 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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