Malicious PDF — malware analysis report

Static analysis result for SHA-256 98264d4d8144c23a…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 16:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ac7d58fc2f821092c1a294b82685efb6 SHA-1: e7174afd464ab5a32f4ef5b2bd0acc29e66712eb SHA-256: 98264d4d8144c23a88798c4ccd5d1b99f3a657576975584df20357e4a59db285
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 CMS uploads 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 0.9942

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 https://cructi.ru/uplcv?utm_term=southern+white+house PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/17ehc57935nf3jlv631pjsgal7/24696956335.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/tikisov.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c35305b2d3a---rinipezojag.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f193063fe11765df13c32a4bfbcfe3fb/rexulavaxumerapi.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dafiwapipigejudejopuz.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7bb00bd6b---boxopoxiroxoralakarapok.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/91008690720.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/33803332155.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1331a364---selapomowul.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f19c19e---47663626347.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160725f607fb98---48314814338.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7554656c5---90207276030.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/tupel.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/birojomitebinujefubigel.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b68b997b6---3687207913.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f695e9daa---laruxalugoxatositenu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/k9rfc0flpknobsjjo68dj3i0l3/67309926375.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tunelojazabekow.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/nidusejakokoj.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/65404953304.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210612192522_iagc3p.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/feradifafinesamiluzul.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/eb6f34ed237db506bca2f6dadf920fe3/ruduloxopajatosomeloga.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/18450905327.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b32fbae32a3---babojozu.pdfIn PDF document text
    • 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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 10256 bytes
SHA-256: 489281c08c00ac99e7ea6f9d3b9dda7a4a19e7d2be336fe66ae00016629a3cb7
font_01_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 18108 bytes
SHA-256: b5c4d907b8f78515e3d9e1fc4474111215953f2eeb82ccf0b9015be066d0adce
font_02_sfnt_off000134e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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