Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a62418cfdad468…

MALICIOUS

PDF

78.9 KB Created: 2021-09-14 11:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01eb5bc6aaa273f56118784ae6140978 SHA-1: 9f5306d9710435e59e35345565c7ccb9561caac4 SHA-256: e0a62418cfdad468ee9e4246a2a180af459c5bbe9c0940a88f380e324bdc4649
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such domains for link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.smartfutureexpo.com/ckfinder/userfiles/files/sirowekabironum.pdf In PDF document text
    • http://olguanaokulu.com/upload/file/vupibebiviwapojoreb.pdfIn PDF document text
    • http://tyextractor.com/d/files/63902208616.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tu99k2tqfm4hskb61sra0feqg1/fipobuzemetafafovunur.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/5822589657.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139df03e1e57---35994757839.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161332bba61cea---rekalesej.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/94967098700.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/5463163076.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/15770814460.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10a0d7281---jotewetubatuzef.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/70684307174.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/jalekodanamigumuki.pdfIn PDF document text
    • http://peoplefoster.com/pliki/18762056122.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/jazanusinafajedurinutux.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/99439055140.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/89175026337.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/sopigalupemazor.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135054c46a73---ferexaza.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/mujoginakozatalugimex.pdfIn PDF document text
    • https://basisnomor.com/contents/files/befowapikaduwemuzexosit.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/komexuxomulibuwagekixa.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/jajinofisurararozu.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/61738163622.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lunuxama.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/noravunulugum.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/bubijegexikeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sonic+the+hedgehog+games+online+unblockedPDF 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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 11124 bytes
SHA-256: 289f5fdecdadd5aff28a819ab7b68200c52b5e7284b4025f5a88c3bfe05ee98b
font_02_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 17196 bytes
SHA-256: 92efc07a6f2adeb0162f18e91e426bb588ad6e50e45de597ac3948cda660a0f3

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