Malicious PDF — malware analysis report

Static analysis result for SHA-256 564a74be35b389d5…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 11:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4588bebba5075aa763d631ffb8815aa2 SHA-1: 0c984723c3b28934ee78d1d67be376eef03b77ea SHA-256: 564a74be35b389d51f14719fa52f23c4f2df5ac815522a35d1b4a4a44a29b3b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is designed as a link farm to redirect users to malicious content, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

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 http://aci-immobilier-douai.fr/userfiles/files/10756130644.pdf In PDF document text
    • http://zxpgw.com/userfiles/file/risebojexatotasa.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikupusoxiwosivig.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/230253595189.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/90932355437.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7da7cf7f9---13925184481.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/77faffcb4fc1d6fe8cae34f14cdf8357/lovidekusada.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/43796217500.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/boguk.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1611e0ec363b32---bipil.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vubar.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/n8ibsk5a7gihdv6e6vmmsr1m5v/wixivikuvajatepowe.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/87527564603.pdfIn PDF document text
    • https://elektrona.cz/files/file/vafitididexurovadetojo.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/49819107547.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/62080983890.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4b5cdc8f68799984dd02edacd34a68ef/falot.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f48b37a0---dobesewipaji.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/razele.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/74061495556.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/ropakupolirovabivawad.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160aff496419e5---63776195699.pdfIn PDF document text
    • http://machin.kr/userData/board/file/38859210545.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/vijixetidol.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/35735192637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=a+five+star+life+full+movie+onlinePDF 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_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10524 bytes
SHA-256: c7252ecdf800209bb29ae0ef5744d22df2336ceb8984de311db6e1714478a12c
font_02_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 17308 bytes
SHA-256: eb385dd8f1e9c599098d8c16f1c3b47e05f4c2b03cf4f1da82086c327a70aa2e