Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4cc79f6911122d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 02:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 97a83c249243bf48310eb63ccfae085e SHA-1: e2b5d16e5a5f8a3403881dbef5740b8424657fed SHA-256: aa4cc79f6911122df6541ed26f1083c7c70538e52e3cd94cbd3f5f139ea307f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=dmv.state.pa.us+drivers+manual PDF link annotation
    • https://aquafilling.com/userfiles/file/72792221194.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/fivepajibile.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/3091189268.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/4df93db43d1c2362192439b46fa08e22/tosokexegutujokawuke.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/60422600641.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/23399728344.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/88616830854.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3127d55ea9---mubugegur.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/48164128833.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/58607451038.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166d5e2bf66---wubuxupibokipagopafobobed.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/bazevusufogosakebixejukes.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/aa55jlppfdsrq73p6nah2347cu/78040289252.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/nopat.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0733c9e097401a5eee69129eea657f28/xuradozuwozimikegorakegi.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/8e07cf76ce42c746e2db24998ddce22a/noxukewijefazu.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/99ea97ffbafb4534a3daec298083e596/sutuwudajisawumopizo.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/wuzakibo.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab261c875f5---57765206999.pdfIn PDF document text
    • https://hirurgija.me/files/97004061459.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078b750e1104---punilupem.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c86eb05bdcb---18767646628.pdfIn PDF document text
    • https://capecoralliving.com/media/file/10665121138.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/vuvuvof.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_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 10664 bytes
SHA-256: d0e7a3e3fc5afd11989f5519d7aef71ddb43e3450a5a7b8d4018116165b945f2
font_02_sfnt_off0000f581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF581 16484 bytes
SHA-256: 745ea1570909f2b45394fb71710d322aa8282bf9cebbd2d8a25540a4858a2cff

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