Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7866b79e8d7331…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 07:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0517ee52ce4939b5a2a5d6cccb6331c8 SHA-1: d69d4cae4383a525509c02da9af7424fc4ae0bbe SHA-256: fb7866b79e8d733109f094e8354269afa285c86da2a8294f2142aabfceff2f4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or delivering malicious content. Several heuristics indicate the document is part of a link farm, directing users to potentially compromised websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://giasudaihocsupham.com/Images_upload/files/3630546371.pdf In PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/91343831679.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lbrqfcjds5prsl8vhs8il5sq45/18248226857.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wituriwopexorek.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/lenitowovopam.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lp93ud5ukh3pgv810pfteef5n7/xofejawatog.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/73092539292.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/33461373981.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/wabififepomik.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/feduvidofafapexepamunarid.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/62589358490.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/674af27524ac7f387e8e41dfef3f9e08/belujijepomoki.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1889ac73b---libuwa.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/94069128349.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/taroxoroxomizelijed.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090320302073499.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/33701286637.pdfIn PDF document text
    • http://otczenacts.com/media/files/gorakej.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/17475663131.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/9140538455.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/tomadixojotakeditaru.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/66533233771.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/vikatogewixamed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=updating+play+support+libraries+stuckPDF 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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 11144 bytes
SHA-256: 383bf190b5c013b34cc08ad92c75f1ab1da15337c939cfdb1e00cf82777e430a
font_01_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 18568 bytes
SHA-256: faf92bcaac6f21a0777843df29db98451baf8e5a0532bf4ecd8976ea899ab5cd
font_02_sfnt_off00013091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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