Malicious PDF — malware analysis report

Static analysis result for SHA-256 954b2cdae3838baa…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 11:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6bae3e82929e0cd3ae0dd533eeba4e0 SHA-1: 89ad3c61df17e79aa84eddd43eccdd24e4049ef3 SHA-256: 954b2cdae3838baa71de00d7a369b1672ed852cc86a321c5aa5cf09657158e0f
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314df076103---duvesetidaf.pdf In PDF document text
    • http://millionsdiscount.com/mo_images/files/64079751442.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/45575352288.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132ef4f8cee9---48294820571.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/damirotunuxabe.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/lowujapikidefoxezogesafiv.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/14024715099.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/jatogoxaxi.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/xubomulelitas.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/nixipewenepaxujupemenoge.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161354ce0e79c5---30876744879.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95bdf039cc39bd72e958f652195a3857/78265313946.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/71619714615.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28295641595.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/22472374626.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/57069986982.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/filalivazabofeguwomud.pdfIn PDF document text
    • http://afro-safari.com/upload/files/67577703373.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/15596212146.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/42351763185.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=call+of+duty+theme+for+androidPDF 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_off0000be4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4D 10696 bytes
SHA-256: ab29b69b2c740ffe04318949244d45a760f9d9085f5ac1c612ceaf54a1e8a335
font_01_sfnt_off0000d6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A3 16804 bytes
SHA-256: 6920d4a1df3e667ff1a7f0abedc3d034a93ec21666b05aa62462d6304f23a8a1
font_02_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1