Malicious PDF — malware analysis report

Static analysis result for SHA-256 c457eea482ebb9b4…

MALICIOUS

PDF

87.8 KB Created: 2021-09-14 04:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: de1ad8587f4f7a84ef9c91125adc3617 SHA-1: 294058147e0d415da88c37ca231c16609f00d956 SHA-256: c457eea482ebb9b48a016b15887670c4ee256e3f350e8c19cb7707122e081577
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a high ML classifier score further suggest malicious intent. The primary goal appears to be redirecting users through a series of links, potentially leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=123movies+brooklyn+nine+nine PDF link annotation
    • http://gniortho.com/files/Upload/file/81305057031.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/429668809613168a95ec09.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/57064501648.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/guvixafuwovi.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb5905170---33359033634.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/73517909862.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/59616619013.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/vepaloraw.pdfIn PDF document text
    • http://anm-av.de/uploads/files/67815123590.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132b74148c20---18547024515.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5vvbsaihecr27lajjert96ihnc/fexigorupuwotiv.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dawubenurodi.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/gaxusemivitidukuga.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130053d9e7ad---51088559786.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6e6c172d---vavokofez.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/96gql5ruocobdg935ei4iiqah4/33493329983.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/lizesuv.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/19219549536.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/nagufebodixotafa.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613332af4e927---21809661250.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/70561946981.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/3198075612.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/xujikotepurizuvajelas.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/ginorotokirep.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/99738473148.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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10668 bytes
SHA-256: e1cf7ff2696efd222694210f9adfe7eed82b0f858f330f74658527ab13777972
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCD 19244 bytes
SHA-256: bb8bb6e0bf6dd66f843a5f8967fcdbab2ae0a81a1706a189dc9f5e24d4d7be49

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