Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca99e19a6362759…

MALICIOUS

PDF

81.4 KB Created: 2021-09-08 03:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c56d5cdda6b03707f5c6f9f3740ed357 SHA-1: fb39348f25d8b3fecb0fca0f35e249440a0df113 SHA-256: bca99e19a6362759dac8eb626538475d3dc1d7aab244024b8fa277156864244a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Several heuristics indicate that the PDF links to compromised WordPress sites, suggesting it's part of a phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095a7e38dc67---49120412829.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160721bbe77954---94715511429.pdfIn PDF document text
    • http://come2menorca.com/images/file/28072614404.pdfIn PDF document text
    • https://alev.az/userfiles/file/bitimasonaxemavot.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/86801842090.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/164e64f7c748f15a8e647c8753a55875/sowanuwokutepuzerimarer.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c879e08719---6710004353.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078adcb3c89b---83191216498.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc988255e26---56095884908.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100b9c5abd6d---27154602372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e20f7ba7b---55682997717.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/morikejirubu.pdfIn PDF document text
    • http://ausafe.net/images/art/files/69326150684.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/wagijiwemi.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/24454792900.pdfIn PDF document text
    • http://rld-carbon.ru/file/79379274397.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1fa5f2b0633520bd87402b7ce51195d7/palimilakufamawili.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/56414808716.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a115c3eed9---mironazenivosubuzewot.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d1a1eac5---55281092021.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/tenolupup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f0becefae---1181256797.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/68527828256.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/11959846881.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/03515f550e0fc7b9c61c73d70e801429/46060526478.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/55385940099.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/jenadepivorexudemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hand+hygiene+checklist+pdfPDF link annotation
    • 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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 10876 bytes
SHA-256: 7480216e32cc2afa95daa7d9b3dbbcfcff93400eb37cd85dc24dbc7104bd3ab7
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17580 bytes
SHA-256: 7b59cfdc51c8c36403f0619d39ee3f99360b400289215e9a075fbb95bca4712c
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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