Malicious PDF — malware analysis report

Static analysis result for SHA-256 4527020c41f8a063…

MALICIOUS

PDF

76.4 KB Created: 2021-09-15 10:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d3853789eaac9c4bd0910c876ac6604 SHA-1: e9ab44cb0f6b51130973eec5ee4ef71e1a4d6a58 SHA-256: 4527020c41f8a0630d2e6bde9ded6a95c5c7b2d7971277194e62cb87a33096c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress uploads, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous URLs suggest an attempt to lead users to malicious content, likely through a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=download+air+attack+hd PDF link annotation
    • http://modernplating.com/userfiles/file/95629971082.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630973252/files/64060021316.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/56236561967.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/japegabuxaxegigo.pdfIn PDF document text
    • http://24cvety.ru/upload/files/55228585976.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/95961604354.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/76084184769.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/11367259165.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/lokoves.pdfIn PDF document text
    • http://iccarrentals.com/files/file/bopofemixukodoxuru.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/zoganalijaremizegesaj.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/88117389849.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/58060314988.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/42097771885.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/21234942110.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2cc8a4ef---jozazi.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109091247491976.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/62376245199.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2f64f43e4e07a6c088634154a1b9d2de/9304606575.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/saradoninudovasuz.pdfIn PDF document text
    • https://dom-titan.rs/files/ludog.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f9f4f960---8775886243.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_off0000bf6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 20352 bytes
SHA-256: 811a71059caffcc88f88c4d48240dd4f5e83840eb7aab634be98b3bd07fcad46
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 10344 bytes
SHA-256: 023788cdbdbefbd6785e1826bd0b86a6a2cf35e5230e3e07e1750c933e7ba965