Malicious PDF — malware analysis report

Static analysis result for SHA-256 752355d5d0e95d87…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 11:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7361290be3c4565921374529547be2d1 SHA-1: 0e425ad8f18c73dc731bb25b3403ac9442bc6619 SHA-256: 752355d5d0e95d87d595816e039284e2c4aab1d8da8efadc9598ceb3beea7bba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=signs+you+are+bipolar PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cj9qk1raphuija36j7m1j8vevh/37712485119.pdfIn PDF document text
    • http://fullx.net/files/tunabijudapaku.pdfIn PDF document text
    • http://apsons.eu/files/file/jenogalu.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/pupixaneregejefuxifiwej.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/surupezodaw.pdfIn PDF document text
    • http://yibetter.com/data/files/22944455260.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613672a3efe82---fesudonosadopazirinufev.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/35370969790.pdfIn PDF document text
    • https://aspirans.com/files/file/xevegokazivok.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/gedibilevulajulelow.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/62815054379.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/57250023186.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/kezomubuzuwegidal.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1831cd468---81681545820.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/11067432232.pdfIn PDF document text
    • https://windsbs.biz/files/file/migimokavozipubexev.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/fodubigazaxegel.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/losonelun.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lodulilenina.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e825ce275c4d3de7039c33c8d80aef7a/22248558615.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/gedulekij.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/88533993423.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/58052374827.pdfIn PDF document text
    • https://onlinendttraining.net/files/telefanijujenimiw.pdfIn 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://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_off0000b101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 17040 bytes
SHA-256: 56870460623796404bcfe2c291eb7e6284101d967a3a7c602c23b3c3a362d0d0
font_01_sfnt_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 10760 bytes
SHA-256: e30c21bdd69a030add3c3a63b66d20b410a94483ce30f0668c6462cdcb8064ef