Malicious PDF — malware analysis report

Static analysis result for SHA-256 2680c2afc8603306…

MALICIOUS

PDF

87.6 KB Created: 2021-08-27 03:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8fb9849ece4344b087144c7cf174cb2 SHA-1: a0f3de8b0eac84c36af2e02a8bac0282845d82b0 SHA-256: 2680c2afc8603306bc40954e8400b46fa3f2559176ca1214145800730824ff28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF used for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=lecture+notes+on+solution+chemistry PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba835133851---vamuva.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/747707114.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/jaributu.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/80941547234.pdfIn PDF document text
    • https://mollis.rs//files/lelugedufijafowud.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/sqehun681cv5ld080fm39gle36/42275121757.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080215372438.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/82965269376.pdfIn PDF document text
    • http://poultech.net/d/files/87453540250.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/zifejabojoxevadox.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/laruzigisimadofag.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/83259432828.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/d9480c7d0463a357058c6e05a4208413/duzenasoxe.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/gugozakojusad.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160770e4b320c1---22385987394.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6083a9e2---fetudepaxobureburuges.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/filijufelusogutizijerudi.pdfIn PDF document text
    • http://lecostationery.com/files/file/89182405695.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sijama.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/51889357626.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zenojivasugadadovazu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/43848242652.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/29408820251.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_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 17548 bytes
SHA-256: 152f4b3ff90bd144c4b98cc4fbde31f931d5663ca03008a342169fb9d78424b5
font_01_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 10504 bytes
SHA-256: 51a98da46e33ca43dc8e0b8a06f170b9f997090f0a3dfc5da7506a73fa574e22
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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