Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b818b52e86fe2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 13:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2c2c18fb8e9424c9b201f9caa433663 SHA-1: c78e81f14d16248ebdac1736d9afcc850c36ef0b SHA-256: 549b818b52e86fe212aaf509796cb78b1fa434e12467b4b961fa95df2b335e34
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 or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://b2cexpressdemo.com/userfiles/file/92671824825.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160860b79e3390---wibegavitebimuwuloxeza.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/07c6e99545e384e0b31584c4eb03a759/57085121876.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c916cc0f9---vadezimi.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/62876597301.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/7659518783.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/18d514546aadbc0e497dee6cb87b1cca/lepawugobovelatudu.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/339568344.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb57ec3bf---gedurikag.pdfIn PDF document text
    • https://hsse.cl/files/jivebafole.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210820_9F81C59B2651643D.pdfIn PDF document text
    • http://nfc.soo.jp/file/sikonitotaku.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cc803961828980c498c27c4b17fc6449/wavadimoxi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7bme74hae8k8cmg5jukkd7a6mo/63304004262.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/noxemiposufepiju.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e67619763a8e02b388fd36942d23bdde/bixafobapem.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/gotetudokenowigoleli.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7237484427.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84dc78fbdc---rasolotazarunepar.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/73068056869.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/53678980141.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/raragunodesijateriwomo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f431a40f0---81112166884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=current+affairs+2018+book+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_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 11308 bytes
SHA-256: 04024730e78845ea70c8145a01e93bb9c03967da43f822321023ae115e68bef3
font_01_sfnt_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 20800 bytes
SHA-256: bf80464c4d32a9e20e463e2943149a9639b5cbb7cd7b7e6e1311ab657a4bfa9b

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