Malicious PDF — malware analysis report

Static analysis result for SHA-256 e740e40e2ce824c8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 12:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 223c37db2db451bbd9828559139e04c7 SHA-1: 06a8a71937646f9cfd7a1165d78f324988940161 SHA-256: e740e40e2ce824c8e5e4af7c63a1d96bc7544a8a401a4d942f7bee00a259b23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs, many hosted on disposable domains or compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://baobihungphu.com/media/ftp/file/fowifanowavopabefosi.pdf In PDF document text
    • http://evola.it/userfiles/files/wozivawagefowexitidilozit.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160906e7d1e092---ropunizi.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/8525076989.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jarilaguvemomavilomobo.pdfIn PDF document text
    • https://andrejc.si/files/file/11936973503.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b23eabc94d---42717459152.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4ce916ca96c11caa2f03e1285b08720c/moduvogewe.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6855728033.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/96983076285.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/56651500543.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fce6e4af---berajaginalelama.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b6e6ab29ca73cd6dddedce5d92e8dd9b/tezijelu.pdfIn PDF document text
    • https://fallsplat.se/file/76494231671.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/6167939013.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dfecce8eb083949be1d28ead57c49c8c/8277122660.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/kimanukabox.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/10318810265.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa07477965---piwetijugubuz.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/dederutuwakivole.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74667539826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ncaa+basketball+bracket+fillable+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_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 10600 bytes
SHA-256: 3dc22454e1d67f1564ba9eef102acc2883a08d2e3c47414e28e4d11af4e00fb3
font_01_sfnt_off0000d662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 17360 bytes
SHA-256: 2fe108af2e41c6d69a2e8bcd1e718cd076ce69ee99dc59f30dde41b532d6bb33

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