Malicious PDF — malware analysis report

Static analysis result for SHA-256 2298f4ec16d1de64…

MALICIOUS

PDF

79.6 KB Created: 2021-09-18 06:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e53d47d9b004379034f0f5f73cdc287 SHA-1: 181a3220272c70061e67fd484a7354e605b384f2 SHA-256: 2298f4ec16d1de64a6b235db07d8b5a1d893451674a582f8ff37f77f9ebede60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links suggests a redirection mechanism to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://wasserentkalkung.at/ckfinder/userfiles/files/96316370784.pdf In PDF document text
    • http://paroissedementon.fr/upload/files/bejodenosozedavirukutanaf.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/bujavijebitoni.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161451fe70ebac---batodunos.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109160951302534.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446d0f1872b---34273538817.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/82422537270.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29337275397.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/zagunutobogajemodi.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28084750423.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/12146d8d22f2675f3b172f4bb717457f/kabozamazole.pdfIn PDF document text
    • http://caythuocnam.org/images/files/15748403363.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/37584550400.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210904153139.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/41436033131.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/edd540312d95ec7e747768bd1883aacc/30318771364.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/33497730716.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/pasoseledededida.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/s1tte0ksnrf8qpp4c3v6s74621/632562769.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fositutumasuguwe.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630490303.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/62345820865.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/43372275855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=php+for+android+applicationPDF 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_off0000d53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53E 16996 bytes
SHA-256: 31c0c91a2ebfb7d68c0d36222fb2eb2dac6d305b7536b5950f87ae17efc3eb0b
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 10416 bytes
SHA-256: f06ffbdd63958e2384cec1e06f8ea35ca7dbb9559d863e563c8601892ceac56f
font_02_sfnt_off000118f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1