Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc095b8602b13568…

MALICIOUS

PDF

82.6 KB Created: 2021-07-25 19:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd495c1b55aef23768f5d727e3147d6f SHA-1: 1d4d264ef25550647e105eb35af81082e1fd64c4 SHA-256: bc095b8602b1356841bff54cc5a0e058a4daf2e83a6f7fb6038becad5a48e810
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a890617787d---22815431759.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51e95cb80---61483447073.pdf
    • http://ray-king67reunion.com/clients/41562/File/goresebonalafunuzes.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ec9b14b6---lipumovixatafujito.pdf
    • http://gramercygrand.ru/files/file/xetimudavowupasinekatikoz.pdf
    • http://stromzeleny.cz/file/32854230328.pdf
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/tezavibazegavusewasivowiz.pdf
    • http://macabrey-luthier.fr/data/Files/28609321856.pdf
    • https://hattoco.vn/images/ckeditor/files/loferivujojojasoxo.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/a7vu7hjehi9f7n7usabmqq99d2/4237279401.pdf
    • https://gotoko.com/cmsv2/upload/files/48782851677.pdf
    • http://chrislahoda.ca/userfiles/file/kalenadudeguwagobimute.pdf
    • http://kapli74.ru/upload_picture/tuvegizoforeb.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0b3d24da5---28385427913.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/561ff7c1f21ccf73f42701d5f05d4425/12511784829.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/224bb4b811f660c603755887359c3d83/jadunusowa.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/284686d31925e51d62f515aefd090d70/wedidiwuwarutujeped.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=animals+which+protect+themselves+from+their+enemies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA9 16792 bytes
font_01_sfnt_off0000f5bb.bin
87beb29da3e6d60b211bd2ce6fdcf61055c0b16d91bfc2ceb2baa481d2e934b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 16928 bytes
font_02_sfnt_off0001213a.bin
9fbdc2123ec2496f6c7183cf498cffa01b8054c9c3b8faba272317969418e1fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 10876 bytes

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