Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54d31525ca525c4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 07:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e734ae7d35312a935d7e98832dc36608 SHA-1: df02862ea3383d4df38c5660563794bb82f81e92 SHA-256: a54d31525ca525c47b791864f521eb28906f2904cc595cca4a45559611f241a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which appear to be compromised WordPress installations or disposable hosting. The embedded JavaScript likely facilitates the redirection to these phishing sites, which is a common tactic for credential harvesting or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=vastarel+20+pdf PDF link annotation
    • http://td-mg.ru/uploads/files/tuvugupodi.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b32111d17---tobexati.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/18055499876.pdfIn PDF document text
    • https://masihpt2.com/contents/files/77484051394.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/82c3f90390e2818f6f2a2c453324f5f5/26520875001.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b7fb968ea8ffea80ac1111653d7d0114/4744012144.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/24095433217.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/nazejesewe.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/10387232619.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a2364bde---rojeraweditada.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608befddcc967---vokasida.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078599a69252---21460491507.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/jarigedaxatogorur.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pusiwun.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/57329578858.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7b2d4047a---39206344898.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb41c0dda---99153006050.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kubipexamagawizise.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/jimejapofobuxitisajupuwiw.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e33c7a5d2---11192555762.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/welanibunokovexabil.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/beganakidifones.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43329889790.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/17311329154.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 17788 bytes
SHA-256: 4f04347279f84d353c64250cc334d133ce79824b7de2d245dcfb7bcbc5d59c7b
font_01_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 10388 bytes
SHA-256: 99d19d401bddd78c37aa4628adaea7335ad302f62f39a5290b9fe50fa18bd770
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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