Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba3d482d3fcd2f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 07:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5eeac2772040fca339762322677e137f SHA-1: 0b43a583ca7c936011e44f90cc6ae0e19072696c SHA-256: 9cba3d482d3fcd2ff5c8fecc29091e2d044bab380e4858384ab08baf30a75574
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 websites or link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=best+android+websites PDF link annotation
    • http://brandiassociati.it/userfiles/file/wajerobixigowuwada.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/vedasesapazevojusozovo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1c6be19f---tudok.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/83575474706.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/nitikoziraju.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681c7e46aa---51194038694.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/41436180791.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/dixefuwozisifupuzepak.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/75876522103.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/tikalitijetejefefasavape.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/1092517244.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/tukilotapibop.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/80956289897.pdfIn PDF document text
    • https://lecachet.fr/docs/files/89543818754.pdfIn PDF document text
    • http://vladekoservis.ru/files/mugidulixopumasuwuguda.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/70188956177.pdfIn PDF document text
    • http://flomojapan.com/upload/files/57527160989.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477909cfe85---1821437480.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e605e2c32---44770161868.pdfIn PDF document text
    • http://dongphat.net/upload/files/dadowewebajesonuxuwuzejo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/83184630890.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/29848457630.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/gerojazadeju.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/76924930831.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/momogegupediru.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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10476 bytes
SHA-256: b515f801ab9c585db7a52a7538123c95df5729fbafc10a41f718e5b407e63aaa
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 16860 bytes
SHA-256: d2cfdafc3949fa5bc42720379d90ee132afd74e8a872dbb24a7f6c7ab72ee62a

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