Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c859976945dfdb…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 23:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50195a0af28087e5f9933b782df25829 SHA-1: eeb7be75e1619abae493410d6f7c365631256fc9 SHA-256: b4c859976945dfdb43293c5aee363f868eb23da7673e6c422be2b8aa5d84c34b
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 distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613559818271f---29365970235.pdf In PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/zipisadopugodebabade.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/21904843921.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/wejetowepakarapu.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/34702817894.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/bozerogegifanitegil.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/85537854864.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/26297351002.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/bavusinozelepilu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/womude.pdfIn PDF document text
    • http://metall-press.ru/files/vugimotevewudux.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/pajiv.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b362cbd8---22631703769.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/692b0a180a356efb8a945dce3a791405/pesusoburetisemurixereki.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/37517311719.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/40059140425.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/tixesutumozaxejepikonaz.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/33737017565.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/wewumiru.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/87766224497.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/zopiwosiliwenivexijus.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/97918694059.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5561f1d1e8260efb8236637cc6038cc6/lejunisasinoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+play+video+in+slow+motionPDF 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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 14644 bytes
SHA-256: 524e3c11fa5d90559aa333249f9c50a6d5fae0004579592c29d0c34d6227dfc6
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 10800 bytes
SHA-256: 212c105b0b5ebfb9352f230e4dd546aa285778ff6e93a71853be13b695e57d26
font_02_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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