Malicious PDF — malware analysis report

Static analysis result for SHA-256 d004bf3ac159f2db…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 10:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6094c6eb8cb07f8ec9b24b546dfe355 SHA-1: 2fd2b7f51769d3e93aa591ef2ecb48e3f8ef460a SHA-256: d004bf3ac159f2db6d51a2af131a0649cb845a10e52a4514c07e7c80edbb96a1
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 delivering malicious content. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b2d0ef2fe---30585978179.pdf In PDF document text
    • http://honda-vo.com/upload/file/koxefopolokujaxuwas.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c89668167c8---navudamexetibexotodu.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/67348162886.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608397609fa9f---geludowewixibusowopak.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/26865220855.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/89056302058.pdfIn PDF document text
    • http://fedoro.ru/upload/file/62790668705.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/28747003293.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/35258dfac89726a57900d3dd30617cd1/85353541717.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/n790acteqkc21b9pjv7u0r0k25/siwolewusemew.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/xuvujivopuxegalolepuxo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afe15d6e294---bekawe.pdfIn PDF document text
    • http://contextuae.com/resimler/files/95641386298.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6cd77441---vugiponawobarixutekab.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/74848841361.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/puwekarulonikudinedozotit.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610540dba91ac---28116652842.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/rarovakum.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/febusilejape.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/46159517740.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f6241cd7dcd---24574157385.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca79d0a24---32520147206.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/dizinawome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=day+3+lh+and+fsh+levelsPDF 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_off0000b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 15552 bytes
SHA-256: bce1d3adb9cb6fca206ab452fc146bdf841c5646c1a46290e48a05d80ed71854
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 10396 bytes
SHA-256: 7186061258203a284e185022466611160cc94a5d43c25befc1929e6541dac1f0

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