Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde74e1a7677e99b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-21 04:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb77c558ddc57c5848902b0573f0a451 SHA-1: 7ffe33ef38dc64377e2fbb8c175405d70a5a8059 SHA-256: cde74e1a7677e99b52154667a3cba6d968dc781f5f5855e900784f54f0645359
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=java+tutorial+in+tamil PDF link annotation
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16148f71915f94---sububinofazelu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/2eb811b82f832d931b9bd3d642465ed2/gozonutavojuvesonaj.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16318548936115.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/mebovezex.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/63052244983.pdfIn PDF document text
    • http://short-story.ru/upload/file/83431641437.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dujifabajutaj.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/peguletatonikowikijud.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/lefefuxedoxefijin.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/lujebufosofep.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370e70ed43e---lokuwun.pdfIn PDF document text
    • https://webmanagement.colortown.ro/images/file/54788583417.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/d2id089t2tc8jj1ntid389tbcl/57335026679.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/41393116611.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/sixemaniv.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zafovututugasutufexakuxax.pdfIn PDF document text
    • http://geasit.it/userfiles/files/44762414880.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/18072673907.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/dopozatupusemuxodosibuwa.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/murexijojudexepafukovova.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/lisebikilaxanegilozobiwej.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/dovomivavixi.pdfIn PDF document text
    • http://medica-brno.com/files/35087921753.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_off0000afa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA5 10124 bytes
SHA-256: 61842b4584e9bdc5b97be21d04caa14fdc4da8c6357ff6e87409c6d72f10d240
font_01_sfnt_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16992 bytes
SHA-256: a8e35782ae4142fc4f4c27b18a56f654985937c95faf3bf21d90a0d6b3a690f8
font_02_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1