Malicious PDF — malware analysis report

Static analysis result for SHA-256 c30334a3d2b05238…

MALICIOUS

PDF

70.9 KB Created: 2021-09-12 18:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb8efabcc97c9879a14da96c83603f82 SHA-1: 137efda1be1fe38791de7befc5aa8d220e8d47c8 SHA-256: c30334a3d2b05238bda1d6f144f7f3d3702a9733ffa6dfbc0c2ec4e77ad37425
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a link farm pointing to compromised CMS upload storage and disposable hosting, coupled with a visual download button lure, indicates a phishing or malware distribution attempt. The embedded URLs suggest the document is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6bd2fc52d54c3b03a297826c9581d165/59945916178.pdf In PDF document text
    • http://zsdbiopharm.com/upload/files/29564093588.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b11c77e31c---70168331069.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/32683407449.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/jakejagufijav.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/leserowikokusirexigu.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/dipojokudumuliwuso.pdfIn PDF document text
    • http://xsteelstock.com/d/files/fezugi.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/nalaja.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65107222237.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/furuludiwufodom.pdfIn PDF document text
    • http://hla.vn/upload/files/32156039593.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/36653881867.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/22080446616.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95a6d31de---80027717237.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/reminomuleboxodoparedadez.pdfIn PDF document text
    • http://citranco.com/users/files/lofogefu.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109081831307709.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/nasoxomitam.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/benixatogimifa.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/riruvokixekuxonaxexikadus.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/dowefeluvirogitopam.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/23206278635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=galaxy+war+game+free+download+for+pcPDF 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_off0000b35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35C 16340 bytes
SHA-256: 6297c5a9d6f54eb06e354f51de18dde39ec4e28cafea7d731d9b1aabca978725
font_01_sfnt_off0000dce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE4 10948 bytes
SHA-256: 1191fb3e7b9fac9897dd08f435b6666999bfea5624e8cc206de4435261ac7eb8
font_02_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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