Malicious PDF — malware analysis report

Static analysis result for SHA-256 146bcf9d4ec775f2…

MALICIOUS

PDF

91.2 KB Created: 2021-10-13 10:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a915effdd83ceb7d16bc8bd5d30b9d5c SHA-1: 21e5392473d31cfe522fd61b515adbb532a69124 SHA-256: 146bcf9d4ec775f202cc39e74af8b213661796bd03eb4731bc4637214674bee7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

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 http://decaiyun.com/upload/file/2109080547564117844n9h4zbtw3ca.pdf In PDF document text
    • http://podhoru.cz/userfiles/file/64729159645.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/82569993092.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/gomolarorodasopedi.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/25660539185.pdfIn PDF document text
    • https://agermag.ro/mm/file/linekonada.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/kesurek.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/31188481713.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/5974286126.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/60374932787.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/60235859393.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/44468880549.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9vh9ncfe63112qfp77s7257df3/28729932792.pdfIn PDF document text
    • https://parfumzone.ro/files/file/telapugiwowapofevi.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/81034362711.pdfIn PDF document text
    • https://beleznayauto.hu/galeria/pictures/vukogap.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615c69f081f5d---61845162827.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/63060173482.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/15045300513.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/f0b3b71c5ea2df9906fccb9ba5329518/zekufiboruvefedafosejaduw.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/paxidobuvogorafukuvam.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/vobilirifavozu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13711086813.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=1+kg+gold+indian+pricePDF 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_off0000eb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 17772 bytes
SHA-256: 556fc40875cec7db7415115535080f16695ba633c5e904483118f69ddb95861b
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 17528 bytes
SHA-256: 898f44be5a844acd523c2549e11d94374df787f8d96e3d37364afbd1aab284ae

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