Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1a9d64a652e852…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 02:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3406677247b541daa124d4291274645 SHA-1: e853881f86bf4fcc759cd113a547de5ab0ee9751 SHA-256: 9c1a9d64a652e8521dde7ce491af0af5e1e76d681afc40a8b162b9cda3c7534d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cuatudongbinhduong.net/uploads/files/foworinanozupewodewi.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709b0935092---legugop.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/juwerimepogamiwafiwin.pdfIn PDF document text
    • https://duvanco.be/docs/files/gulimimusedimurusetefumu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ddb1bbc904bd35b00541428ed15c655f/11411219960.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ebbe7129---53637880517.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/culu0midhdveo3ohv7m3vsbgpf/xirowigokasigakeginasudum.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/43734814792.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160822032226cb---16297708031.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/dubopulare.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/74788763597.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/domite.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/25224609705.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/11164579742.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/tawiped.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/tijumifuvilutaroborana.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2jufmd4bmkf5o8hcasnvul9h1h/xolinidujobiloga.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fd3ab2f2c---17501633342.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/nowisekaju.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22753de97c---vujemif.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/16877945160.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/larikikebapujosage.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/7630786291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cryopreservation+of+cells+pdfPDF 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

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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 17636 bytes
SHA-256: ff05fc13df7ce43e66389b0b686c38e9d097aff721787530deda83a2c88f0a4d
font_01_sfnt_off000102ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FF 10824 bytes
SHA-256: e5cd847726d5dc55871c9853b26dfd9213fb45c8fd08f51d5b88d48bc96de650
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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