Malicious PDF — malware analysis report

Static analysis result for SHA-256 d839c733b072422d…

MALICIOUS

PDF

97.3 KB Created: 2021-07-25 05:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 360d4b908af6eefb0d4224a816bf7eb5 SHA-1: 4dc431f5a26134f59553324b399c3e01f1e9b1d5 SHA-256: d839c733b072422d7b5eb93eb77a2e8a4042ff462167c89c8d99fcfda1dd135a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://firanywiktoria.pl/uploads/editor/file/99469059965.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/68957486254.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9e6dc59c---nifafo.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/3896823461.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/12483008488.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078529d203a8---rujezewoju.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3815f84894---33639728559.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c424a4accf4---vonuxeviserudikufi.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wusakisumizaxemat.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/4823187451.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb7009a68---93933595910.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0ch6fch72crgefjccarsmi0m91/34576445211.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/pojidewufe.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/kebigupirug.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/38000555937.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084efad91f49---pusivi.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/11603067927.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/dapevejilibifizew.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762513b5c84---libeg.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7d3937e0---rebulozafutapatulum.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/giwitubozumesuxazum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e1dbb6d2---silufugudexaxorolat.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/lagasexedisebuwul.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b86ecf100f9eb47fe0880975117772a3/zevevodipizajuposotepesof.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/64716008702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+walking+dead+our+world+gold+hackPDF 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_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10624 bytes
SHA-256: 69e88f543a04b2716cd42bd10246a17472cbb9045d36775f89bd6b10b5fc0b90
font_01_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 17368 bytes
SHA-256: f8f5b4b040fba47fe8aba1b8ab4a8606bd0bc0c0e92a5963c8ec487a127e3972
font_02_sfnt_off00015c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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