Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8577375e08c85a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 21:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cbec1ab7dd7d270589ece580105a41d SHA-1: 53828264962d4165b0369fcd0cbd7f6fc2489cf0 SHA-256: 9d8577375e08c85a82cbf3809a45555548cc70ca18a563c0c0d40fdb0796384f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the redirection of users to malicious content hosted on compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c5be4c8b9---30488422685.pdf In PDF document text
    • http://avistravel.ro/userfiles/file/jazezijumovejifog.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17620271986.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/1705373774.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f32d2c637afdf5641fc0bd7a0efe8692/66214771554.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/97284862608.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/tobolu.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/wapoder.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/gusepogixoluwovuse.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613562b899a61---kijavut.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/jitilerizodojadixi.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/dulamux.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/zetewimafanofefatewuf.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/wikinelexirudavowem.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/86333463439.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/vifofufajamezinofujimave.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa39033bd---16650737189.pdfIn PDF document text
    • http://firegallery.ru/img/upload/fefozifidimezabunabowizek.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/nukizuwolinazadibixofepo.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/71686122433.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375761cf5f0---59918528787.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/81805513241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=histology+books+for+mbbs+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_off0000c5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 17612 bytes
SHA-256: 4c173a4516de08573044bdc88970b2ff8f22e5b27be0ca4c2d05c9a72847d68f
font_02_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 10780 bytes
SHA-256: b272a9cad7dd6f4949ff3b5126ac9220645a1897c5bbe0cde4bd1e5b6d5a85f5

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