Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca61ed7987c4100…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 00:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e82d62f4881200611a5ee6d7ba4a0f9a SHA-1: c97a5dcb7431618f2bd819f2bd2059d7c316efd0 SHA-256: 5ca61ed7987c4100228cb8f140bf7ce7c007a7761997b8d9ff5ab44eecf2fb53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests the use of compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=minna+no+nihongo+n3+pdf PDF link annotation
    • http://studioriboldi.eu/userfiles/files/99678585964.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/povuwasogavo.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/konogatexinefodaxow.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/wadumilawegujona.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210908/210908155109213921zo2sl1fxfhgb.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfe91dcfa---xoman.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/fuzilegekofop.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/24042890126.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/14641554465.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/43391105959.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/88390352420.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/25055935417.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/33adf81c27b5b790565b77664675bcef/gunomikobevututukedepepan.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/68186147104.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/karora.pdfIn PDF document text
    • http://domuran.pl/files/file/48411493370.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/zatelom.pdfIn PDF document text
    • http://www.moyekolodin.com/files/39721315786.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0c77509b559ae838f8392f4ccb4fd26c/nijiw.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/62011975891.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/wevumavorove.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wotajifof.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_off0000bb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB00 23724 bytes
SHA-256: 2520690ab6250828172d90f156e0e2866629d905aa3b6afbdb65043e350bc7dd
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 10396 bytes
SHA-256: 98c2e15f7bccf6dade49b0e537ac346386b6e9b4ed3fab27859e13d89e65bfcb

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