Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ded9e78ae3899…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 22:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dd85ab08846cc13433716e752266dfdb SHA-1: 26d4e53c3172e8819fe6de582411213613540038 SHA-256: c39ded9e78ae389902d27a8918c60b0ef8df0b07177490847a8cdd6bcb24531f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm or phishing lure. The URL 'https://coretry.ru/uplcv?utm_term=pokemon+x+and+y+download+emulator' indicates a lure related to game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pokemon+x+and+y+download+emulator PDF link annotation
    • http://jjkxmy.com/upload/files/202109050451234077.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/pogamugupuja.pdfIn PDF document text
    • http://yoron.net/up/files/72311360796.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/67100056537.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcb9d7d96---61294441240.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/buvebot.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/gepumixetodadawi.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kikukonoluloxibamepemozu.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/motew.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/20249536913.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/73659222031.pdfIn PDF document text
    • http://telektrans.hu/editor_up/86604542155.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/41897999260.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f651b161---36301463335.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/82830744588.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nisorodamomowek.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/20007789362.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210911021839.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/pobokepisap.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/pebimekelogasedi.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/megepakivefobubepojonub.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/57084546461.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411d42e1eb7---7252770097.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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 18636 bytes
SHA-256: 2959b873e1c1881e32ec062447b6093a59e9aecf3d8b7a28ca45eb916735d03f
font_02_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 10644 bytes
SHA-256: 04566b846fc4a90a951bc4bd66a65d97ce83669d326204a9cc4db300cbe749c4