Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93a994af6e2d07c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 16:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad52ea667dde083c27a4224c5fee0563 SHA-1: 2cc6fe4bdb27b266b6b898998e90f764b5966c25 SHA-256: f93a994af6e2d07cbdc1e41c8dcf87a0d5af2076db829b1a73fad7530d830307
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript further suggests malicious intent, likely to facilitate the redirection or exploit vulnerabilities. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ryrie+study+bible+pdf+download PDF link annotation
    • http://puginternational.com/ckfinder/userfiles/files/vutijinesetoboder.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe6267998---6575289707.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/33889219438.pdfIn PDF document text
    • http://artediapharma.com/upload/files/bawaxedukudoparupek.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/35612825069.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/ketodatenuvopesokisip.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/muginu.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210915151524.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109132029306241.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac185720b---75490121949.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/59987537246.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/fusexowo.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/87644448206.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4e57c0778285191049ce2761a53406e1/81670793.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/salazibudoruves.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/talovimade.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/87072322306.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614501eee7ecb---58072342638.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/28582615678.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/3346453942.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/97082874298.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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 18380 bytes
SHA-256: 31a3fb21d20d554b6cc06ec0cdb398d80030a3b90014196859e915689f3c8d22
font_01_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 10976 bytes
SHA-256: 7aa776ebe3c938ed8925c7644082fd5cf6718fa81bd8481109a50d7b69be60b1
font_02_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1