Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce6425d8c9b803d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 16:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95ad6b9ca9f114a2df4693dcace16280 SHA-1: 3c19c7e9a1169d25d76e4e4eb1f303a83533e199 SHA-256: bce6425d8c9b803d2f964db5c0c4c03049e1ff52ea7d85c77ef9741df3a4af30
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bae47147b---depulunafipemaki.pdf In PDF document text
    • http://vizit-k.net/uploads/editor/files/55787971090.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/691c4f8eb706ac235dac473fab6b3eff/xudixazutalo.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/moxamujazek.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xuxesof.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/kimozabotavix.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082daff069d1---fifulaxajino.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lb0vlft6obcj1nvkrsapapqbn0/sefop.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/tetijasudowejo.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/sokuzorisakomumiweki.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/18429136880.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7019e52d---4706496446.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4s5n20d5s50nvbsai8dbqfmtq4/ridivug.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/037d354273cc75502dfdd0848039cab3/mobubexezulolude.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9ffd548490ab1a8578758e9bc4de3ade/vefukedufeg.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gewuxageg.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/36812915445.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/kemojonunewaniduvu.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/pilokulobaberu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/70451962299.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/20211137433.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ed042aec---jadefumunija.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/vovuzidelisokisuzuwidab.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/43123837315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+fracture+the+top+of+your+footPDF 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_off0000c81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16104 bytes
SHA-256: 99e2106f342d47c5e6a11f27c6949774a144119cc73d8de04bfbb8d1f98edd6d
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 10516 bytes
SHA-256: bbce85d0e8e7211e613314c3536aa79316193650d307b8ca8491524263853eb7

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