Malicious PDF — malware analysis report

Static analysis result for SHA-256 0518ca3ae1e5adce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 02:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76184b38b801d6b6fc8c96cd3be8184b SHA-1: f57ba40d5b6458f1cc48017dbbed6a3c679126fd SHA-256: 0518ca3ae1e5adce759501442a70cd4c9ded2ba7598a42ddeea35fbb463a73d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to redirect users to malicious sites. The embedded JavaScript and the nature of the URLs suggest an attempt to download further malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=hd+streamz+mod+apk+download+for+android PDF link annotation
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bc0f1baf---24054568436.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/91556002761304f617f139.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/woxugikonelamiwuwiz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd9913271---gufivonabazutomu.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68086973676.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/liborufapusutaburelale.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/58217647623.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/53144570557.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/rivixe.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/9108078838.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/woxoz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135615533367---zisuwuwerezofugodebalane.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/nazapopijosomokegida.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/duviwadiw.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/68985741321.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e869031ab0cafffa85f2395f1d1b88ab/52333026922.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/53278302710.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/79368472495.pdfIn PDF document text
    • http://techbis.pl/files/file/70263982576.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136039021e74---64395424170.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/kokozedewux.pdfIn PDF document text
    • http://lblussana.it/images/file/bawinobelafijidoru.pdfIn PDF document text
    • http://ktcz.eu/files/files/kasejone.pdfIn PDF document text
    • https://synersys.fr/contenu/file/87514748942.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_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16864 bytes
SHA-256: 25b3d0d6391911283e0ad5adff733b7b308e6d91d6aca25992777cb37f5a795c
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 10888 bytes
SHA-256: fbbf6a269ef5a7be8cab8dce0af9f79de6b4c28db9d706a8a32dfab174191810

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