Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c3a0315187ef5e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 00:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbd09c4ef3b65976a3b51a2e7dfcc8f1 SHA-1: aea798a4ca0d744b52bae618474ccfce4b8d8c6c SHA-256: 61c3a0315187ef5ecc9c1eb54798dc2c948e1ed25fdc2b71c4d48060ed966cac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://designclarf.it/file/93317896786.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zufobadadujiveruduvug.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef1d12bec3---10482893515.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/mafivoxinutukefuwu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a419a62372---40119896667.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/72913720910.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/koluboxilalebalisivatibup.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/83906119892.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f19897210---xewipefisezaselifepezowil.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/xatamalarumoguzekoboreta.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/51975959342.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1632084620873883790.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/86363751607.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/98310909258.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/sidafevoj.pdfIn PDF document text
    • http://idroter.org/userfiles/files/27872383334.pdfIn PDF document text
    • http://thaymanhinhlaptop.com/userfiles/file/57678734549.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/fuxer.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/kokufebibelexosukaz.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/lutezumuzunisexituteme.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/38596062242.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/ravalidigorid.pdfIn PDF document text
    • https://designclarf.it/file/79200353118.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/52870593254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spdf+configuration+of+first+30+elementsPDF 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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 11432 bytes
SHA-256: 36a30212523bc65a0812a739ca3d849cf4e4c66c70b0467c630b7375781690c4
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 15524 bytes
SHA-256: 4c1a8fdedac18a03bceea38a607371ed9d610cec6ef074d9bd46bce3cdf3f5cb
font_02_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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