Malicious PDF — malware analysis report

Static analysis result for SHA-256 e446be012337b6df…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 08:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fef821bebf8d27aba1f0acce7605dde1 SHA-1: 90dce9151841e6466cc1034e5e75e64954b7f202 SHA-256: e446be012337b6dff6419a3f1bee53bd0507ac53df3e3f102f30c351ea7d81d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external links, many pointing to compromised CMS upload directories, further suggests an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cc908cf1---womepepejokisopobasexuf.pdf In PDF document text
    • https://sport-jicin.cz/dokumenty/19180111934.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f5598e10f6556fb19ae3fe9a82c2a9cc/92084608405.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/68522721661.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bcd6d5512---kigerepuwezezijinenejexa.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/budogoberodagifuvi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a024f6c5bf---87604953251.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608139f64f8a9---62557259461.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/rifapezabefex.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/sowenirujexovenomon.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30567ac87---togulobivadezofajiw.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee718b269c9---76195737402.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/59016735887.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/lilanivavelemuzenagotokiz.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/12rq61fuh8jsv63rq7qdjlq3up/judesiwagapaxuzusasefev.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/vakipanikezukazebofowede.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tanumifosukukutulezuziwo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cceac70efe2---89407745694.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/kavekapep.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/beruzosowavobakejewamen.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/tivavisugekiluxigutabe.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/6452513442.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98290c214aa1989ec8cd85bc49906542/worapanifuguxavegelaje.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/zebetusowe.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/litogonifevise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=importancia+de+la+historia+clinica+en+ortodoncia+pdfPDF 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_off0000fba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 10836 bytes
SHA-256: 5a8deda3e01313a97e03cf9b2f700e23915ce2496c6a1fda8a6aeb264b83162e
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 19340 bytes
SHA-256: 96d739987da414c6730687787a264b245726d6577540bb703863dc2ae0290f23

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